<?xml version="1.0" encoding="utf-8"?>
<!--Generated by DFIN XBRL Instance Document - http://www.dfinsolutions.com/ - Version R3.0 - on 01-March-2021 [02:43:23] {PM}-->
<linkbase xmlns="http://www.xbrl.org/2003/linkbase" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xlink="http://www.w3.org/1999/xlink" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" xmlns:xbrldt="http://xbrl.org/2005/xbrldt">
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#ConsolidatedStatementsOfEarningsAndComprehensiveIncome" roleURI="http://www.cvbfinancialcorp.com/role/ConsolidatedStatementsOfEarningsAndComprehensiveIncome" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#ConsolidatedStatementsOfStockholdersEquity" roleURI="http://www.cvbfinancialcorp.com/role/ConsolidatedStatementsOfStockholdersEquity" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#BusinessAdditionalInformationDetail" roleURI="http://www.cvbfinancialcorp.com/role/BusinessAdditionalInformationDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#SummaryOfSignificantAccountingPoliciesAdditionalInformationDetail" roleURI="http://www.cvbfinancialcorp.com/role/SummaryOfSignificantAccountingPoliciesAdditionalInformationDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#SummaryOfSignificantAccountingPoliciesSummaryOfUsefulLivesOfPrincipalClassesOfAssetsDetail" roleURI="http://www.cvbfinancialcorp.com/role/SummaryOfSignificantAccountingPoliciesSummaryOfUsefulLivesOfPrincipalClassesOfAssetsDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#BusinessCombinationsAdditionalInformationDetail" roleURI="http://www.cvbfinancialcorp.com/role/BusinessCombinationsAdditionalInformationDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#BusinessCombinaionsScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedDetail" roleURI="http://www.cvbfinancialcorp.com/role/BusinessCombinaionsScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#BusinessCombinationsBusinessAcquisitionProFormaInformationDetail" roleURI="http://www.cvbfinancialcorp.com/role/BusinessCombinationsBusinessAcquisitionProFormaInformationDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#InvestmentSecuritiesSummaryOfAmortizedCostAndEstimatedFairValueOfInvestmentSecuritiesDetail" roleURI="http://www.cvbfinancialcorp.com/role/InvestmentSecuritiesSummaryOfAmortizedCostAndEstimatedFairValueOfInvestmentSecuritiesDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#InvestmentSecuritiesSummaryOfInterestIncomeEarnedOnInvestmentSecuritiesDetail" roleURI="http://www.cvbfinancialcorp.com/role/InvestmentSecuritiesSummaryOfInterestIncomeEarnedOnInvestmentSecuritiesDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#InvestmentSecuritiesSummaryOfContinuousUnrealizedLossPositionOfSecuritiesDetail" roleURI="http://www.cvbfinancialcorp.com/role/InvestmentSecuritiesSummaryOfContinuousUnrealizedLossPositionOfSecuritiesDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#InvestmentSecuritiesAdditionalInformationDetail" roleURI="http://www.cvbfinancialcorp.com/role/InvestmentSecuritiesAdditionalInformationDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#LoansAndLeaseFinanceReceivablesAndAllowanceForCreditLossesAdditionalInformationDetail" roleURI="http://www.cvbfinancialcorp.com/role/LoansAndLeaseFinanceReceivablesAndAllowanceForCreditLossesAdditionalInformationDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#LoansAndLeaseFinanceReceivablesAndAllowanceForCreditLossesSummaryOfComponentsOfLoansAndLeaseFinanceReceivablesIncludingPciLoansDetail" roleURI="http://www.cvbfinancialcorp.com/role/LoansAndLeaseFinanceReceivablesAndAllowanceForCreditLossesSummaryOfComponentsOfLoansAndLeaseFinanceReceivablesIncludingPciLoansDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#LoansAndLeaseFinanceReceivablesAndAllowanceForCreditLossesSummaryOfLoansByTypeAndOriginationYearAccordingToOurInternalRiskRatingsDetail" roleURI="http://www.cvbfinancialcorp.com/role/LoansAndLeaseFinanceReceivablesAndAllowanceForCreditLossesSummaryOfLoansByTypeAndOriginationYearAccordingToOurInternalRiskRatingsDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#LoansAndLeaseFinanceReceivablesAndAllowanceForCreditLossesSummaryOfLoanIncludingPciLoansByInternalRiskRatingsDetail" roleURI="http://www.cvbfinancialcorp.com/role/LoansAndLeaseFinanceReceivablesAndAllowanceForCreditLossesSummaryOfLoanIncludingPciLoansByInternalRiskRatingsDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#LoansAndLeaseFinanceReceivablesAndAllowanceForCreditLossesScheduleOfBalanceAndActivityRelatedToAllowanceForLoanLossesForHeldForInvestmentLoansByTypeDetail" roleURI="http://www.cvbfinancialcorp.com/role/LoansAndLeaseFinanceReceivablesAndAllowanceForCreditLossesScheduleOfBalanceAndActivityRelatedToAllowanceForLoanLossesForHeldForInvestmentLoansByTypeDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#LoansAndLeaseFinanceReceivablesAndAllowanceForCreditLossesScheduleOfRecordedInvestmentInLoansHeldForInvestmentAndRelatedAllowanceForLoanLossesByLoanTypeDetail" roleURI="http://www.cvbfinancialcorp.com/role/LoansAndLeaseFinanceReceivablesAndAllowanceForCreditLossesScheduleOfRecordedInvestmentInLoansHeldForInvestmentAndRelatedAllowanceForLoanLossesByLoanTypeDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#LoansAndLeaseFinanceReceivablesAndAllowanceForCreditLossesScheduleOfRecordedInvestmentInAndAgingOfPastDueAndNonaccrualLoansIncludingPciLoansByClassOfLoansDetail" roleURI="http://www.cvbfinancialcorp.com/role/LoansAndLeaseFinanceReceivablesAndAllowanceForCreditLossesScheduleOfRecordedInvestmentInAndAgingOfPastDueAndNonaccrualLoansIncludingPciLoansByClassOfLoansDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#LoansAndLeaseFinanceReceivablesAndAllowanceForCreditLossesScheduleOfRecordedInvestmentInAndAgingOfPastDueAndNonaccrualLoansIncludingPciLoansByClassOfLoansParentheticalDetail" roleURI="http://www.cvbfinancialcorp.com/role/LoansAndLeaseFinanceReceivablesAndAllowanceForCreditLossesScheduleOfRecordedInvestmentInAndAgingOfPastDueAndNonaccrualLoansIncludingPciLoansByClassOfLoansParentheticalDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#LoansAndLeaseFinanceReceivablesAndAllowanceForCreditLossesScheduleOfHeldForInvestmentLoansIndividuallyEvaluatedForImpairmentByClassOfLoansDetail" roleURI="http://www.cvbfinancialcorp.com/role/LoansAndLeaseFinanceReceivablesAndAllowanceForCreditLossesScheduleOfHeldForInvestmentLoansIndividuallyEvaluatedForImpairmentByClassOfLoansDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#LoansAndLeaseFinanceReceivablesAndAllowanceForCreditLossesSummaryOfRecordedInvestmentInCollateralDependentLoansDetail" roleURI="http://www.cvbfinancialcorp.com/role/LoansAndLeaseFinanceReceivablesAndAllowanceForCreditLossesSummaryOfRecordedInvestmentInCollateralDependentLoansDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#LoansAndLeaseFinanceReceivablesAndAllowanceForCreditLossesSummaryOfActivityRelatedToTroubledDebtRestructuringsDetail" roleURI="http://www.cvbfinancialcorp.com/role/LoansAndLeaseFinanceReceivablesAndAllowanceForCreditLossesSummaryOfActivityRelatedToTroubledDebtRestructuringsDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#LoansAndLeaseFinanceReceivablesAndAllowanceForCreditLossesSummaryOfLoansModifiedAsTroubledDebtRestructuringsDetail" roleURI="http://www.cvbfinancialcorp.com/role/LoansAndLeaseFinanceReceivablesAndAllowanceForCreditLossesSummaryOfLoansModifiedAsTroubledDebtRestructuringsDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#PremisesAndEquipmentAdditionalInformationDetail" roleURI="http://www.cvbfinancialcorp.com/role/PremisesAndEquipmentAdditionalInformationDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#IncomeTaxesScheduleOfIncomeTaxAssetDetail" roleURI="http://www.cvbfinancialcorp.com/role/IncomeTaxesScheduleOfIncomeTaxAssetDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#BorrowingsAdditionalInformationDetail" roleURI="http://www.cvbfinancialcorp.com/role/BorrowingsAdditionalInformationDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#CommitmentsAndContingenciesAdditionalInformationDetail" roleURI="http://www.cvbfinancialcorp.com/role/CommitmentsAndContingenciesAdditionalInformationDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#EmployeeBenefitPlansAdditionalInformationDetail" roleURI="http://www.cvbfinancialcorp.com/role/EmployeeBenefitPlansAdditionalInformationDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#StockBasedCompensationPlansAdditionalInformationDetail" roleURI="http://www.cvbfinancialcorp.com/role/StockBasedCompensationPlansAdditionalInformationDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#StockBasedCompensationPlansEstimatedFairValueOfStockOptionsDetail" roleURI="http://www.cvbfinancialcorp.com/role/StockBasedCompensationPlansEstimatedFairValueOfStockOptionsDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#StockBasedCompensationPlansSummaryOfStatusOfCompanysNonVestedRestrictedSharesDetail" roleURI="http://www.cvbfinancialcorp.com/role/StockBasedCompensationPlansSummaryOfStatusOfCompanysNonVestedRestrictedSharesDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#RegulatoryMattersRegulatoryCapitalAmountsAndRatiosForCompanyAndBankDetail" roleURI="http://www.cvbfinancialcorp.com/role/RegulatoryMattersRegulatoryCapitalAmountsAndRatiosForCompanyAndBankDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#FairValueInformationAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetail" roleURI="http://www.cvbfinancialcorp.com/role/FairValueInformationAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#FairValueInformationAssetsAndLiabilitiesMeasuredAtFairValueOnNonRecurringBasisDetail" roleURI="http://www.cvbfinancialcorp.com/role/FairValueInformationAssetsAndLiabilitiesMeasuredAtFairValueOnNonRecurringBasisDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#FairValueInformationEstimatedFairValueOfFinancialInstrumentsDetail" roleURI="http://www.cvbfinancialcorp.com/role/FairValueInformationEstimatedFairValueOfFinancialInstrumentsDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#DerivativeFinancialInstrumentsAdditionalInformationDetail" roleURI="http://www.cvbfinancialcorp.com/role/DerivativeFinancialInstrumentsAdditionalInformationDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#DerivativeFinancialInstrumentsFairValueOfDerivativeInstrumentsDetail" roleURI="http://www.cvbfinancialcorp.com/role/DerivativeFinancialInstrumentsFairValueOfDerivativeInstrumentsDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#DerivativeFinancialInstrumentsEffectOfDerivativeInstrumentsOnConsolidatedStatementOfEarningsDetail" roleURI="http://www.cvbfinancialcorp.com/role/DerivativeFinancialInstrumentsEffectOfDerivativeInstrumentsOnConsolidatedStatementOfEarningsDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#BalanceSheetOffsettingScheduleOfBalanceSheetOffsettingDetail" roleURI="http://www.cvbfinancialcorp.com/role/BalanceSheetOffsettingScheduleOfBalanceSheetOffsettingDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#LeasesComponentsOfLeaseCostsAndSupplementalInformationRelatedToLeasesDetail" roleURI="http://www.cvbfinancialcorp.com/role/LeasesComponentsOfLeaseCostsAndSupplementalInformationRelatedToLeasesDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#LeasesFutureLeasePaymentsRequiredForLeasesThatHaveInitialOrRemainingNonCancelableLeaseTermsDetail" roleURI="http://www.cvbfinancialcorp.com/role/LeasesFutureLeasePaymentsRequiredForLeasesThatHaveInitialOrRemainingNonCancelableLeaseTermsDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#RevenueRecognitionSummaryOfNonInterestIncomeSegregatedByRevenueStreamsInScopeAndOutOfScopeOfTopic606Detail" roleURI="http://www.cvbfinancialcorp.com/role/RevenueRecognitionSummaryOfNonInterestIncomeSegregatedByRevenueStreamsInScopeAndOutOfScopeOfTopic606Detail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#CondensedFinancialInformationOfParentCompanyCondensedBalanceSheetsDetail" roleURI="http://www.cvbfinancialcorp.com/role/CondensedFinancialInformationOfParentCompanyCondensedBalanceSheetsDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#CondensedFinancialInformationOfParentCompanyCondensedStatementsOfEarningsDetail" roleURI="http://www.cvbfinancialcorp.com/role/CondensedFinancialInformationOfParentCompanyCondensedStatementsOfEarningsDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#CondensedFinancialInformationOfParentCompanyCondensedStatementsOfCashFlowsDetail" roleURI="http://www.cvbfinancialcorp.com/role/CondensedFinancialInformationOfParentCompanyCondensedStatementsOfCashFlowsDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#CoverPage" roleURI="http://www.cvbfinancialcorp.com/role/CoverPage" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#ConsolidatedBalanceSheetsParenthetical" roleURI="http://www.cvbfinancialcorp.com/role/ConsolidatedBalanceSheetsParenthetical" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#ConsolidatedStatementsOfStockholdersEquityParenthetical" roleURI="http://www.cvbfinancialcorp.com/role/ConsolidatedStatementsOfStockholdersEquityParenthetical" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#InvestmentSecuritiesSummaryOfAmortizedCostAndFairValueOfDebtSecuritiesByContractualMaturityDetail" roleURI="http://www.cvbfinancialcorp.com/role/InvestmentSecuritiesSummaryOfAmortizedCostAndFairValueOfDebtSecuritiesByContractualMaturityDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#OtherRealEstateOwnedSummaryOfActivityRelatedToTotalOreoDetail" roleURI="http://www.cvbfinancialcorp.com/role/OtherRealEstateOwnedSummaryOfActivityRelatedToTotalOreoDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#GoodwillAndOtherIntangibleAssetsChangesInCarryingAmountOfGoodwillDetail" roleURI="http://www.cvbfinancialcorp.com/role/GoodwillAndOtherIntangibleAssetsChangesInCarryingAmountOfGoodwillDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#GoodwillAndOtherIntangibleAssetsSummaryOfAmortizableIntangibleAssetsDetail" roleURI="http://www.cvbfinancialcorp.com/role/GoodwillAndOtherIntangibleAssetsSummaryOfAmortizableIntangibleAssetsDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#GoodwillAndOtherIntangibleAssetsAdditionalInformationDetail" roleURI="http://www.cvbfinancialcorp.com/role/GoodwillAndOtherIntangibleAssetsAdditionalInformationDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#PremisesAndEquipmentScheduleOfPremisesAndEquipmentDetail" roleURI="http://www.cvbfinancialcorp.com/role/PremisesAndEquipmentScheduleOfPremisesAndEquipmentDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#OtherAssetsSummaryOfOtherAssetsDetail" roleURI="http://www.cvbfinancialcorp.com/role/OtherAssetsSummaryOfOtherAssetsDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#IncomeTaxesScheduleOfIncomeTaxExpenseDetail" roleURI="http://www.cvbfinancialcorp.com/role/IncomeTaxesScheduleOfIncomeTaxExpenseDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#IncomeTaxesComponentsOfNetDeferredTaxAssetDetail" roleURI="http://www.cvbfinancialcorp.com/role/IncomeTaxesComponentsOfNetDeferredTaxAssetDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#IncomeTaxesReconciliationOfStatutoryIncomeTaxRateToConsolidatedEffectiveIncomeTaxRateDetail" roleURI="http://www.cvbfinancialcorp.com/role/IncomeTaxesReconciliationOfStatutoryIncomeTaxRateToConsolidatedEffectiveIncomeTaxRateDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#IncomeTaxesAdditionalInformationDetail" roleURI="http://www.cvbfinancialcorp.com/role/IncomeTaxesAdditionalInformationDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#DepositsCompositionOfDepositsDetail" roleURI="http://www.cvbfinancialcorp.com/role/DepositsCompositionOfDepositsDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#DepositsAdditionalInformationDetail" roleURI="http://www.cvbfinancialcorp.com/role/DepositsAdditionalInformationDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#PremisesAndEquipment" roleURI="http://www.cvbfinancialcorp.com/role/PremisesAndEquipment" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#PremisesAndEquipmentTables" roleURI="http://www.cvbfinancialcorp.com/role/PremisesAndEquipmentTables" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#OtherAssets" roleURI="http://www.cvbfinancialcorp.com/role/OtherAssets" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#OtherAssetsTables" roleURI="http://www.cvbfinancialcorp.com/role/OtherAssetsTables" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#IncomeTaxes" roleURI="http://www.cvbfinancialcorp.com/role/IncomeTaxes" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#IncomeTaxesTables" roleURI="http://www.cvbfinancialcorp.com/role/IncomeTaxesTables" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#Borrowings" roleURI="http://www.cvbfinancialcorp.com/role/Borrowings" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#CommitmentsAndContingencies" roleURI="http://www.cvbfinancialcorp.com/role/CommitmentsAndContingencies" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#EmployeeBenefitPlans" roleURI="http://www.cvbfinancialcorp.com/role/EmployeeBenefitPlans" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#EarningsPerShareReconciliation" roleURI="http://www.cvbfinancialcorp.com/role/EarningsPerShareReconciliation" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#EarningsPerShareReconciliationTables" roleURI="http://www.cvbfinancialcorp.com/role/EarningsPerShareReconciliationTables" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#StockBasedCompensationPlans" roleURI="http://www.cvbfinancialcorp.com/role/StockBasedCompensationPlans" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#StockBasedCompensationPlansTables" roleURI="http://www.cvbfinancialcorp.com/role/StockBasedCompensationPlansTables" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#Deposits" roleURI="http://www.cvbfinancialcorp.com/role/Deposits" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#DepositsTables" roleURI="http://www.cvbfinancialcorp.com/role/DepositsTables" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#RegulatoryMatters" roleURI="http://www.cvbfinancialcorp.com/role/RegulatoryMatters" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#RegulatoryMattersTables" roleURI="http://www.cvbfinancialcorp.com/role/RegulatoryMattersTables" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#FairValueInformation" roleURI="http://www.cvbfinancialcorp.com/role/FairValueInformation" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#FairValueInformationTables" roleURI="http://www.cvbfinancialcorp.com/role/FairValueInformationTables" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#OtherComprehensiveIncome" roleURI="http://www.cvbfinancialcorp.com/role/OtherComprehensiveIncome" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#OtherComprehensiveIncomeTables" roleURI="http://www.cvbfinancialcorp.com/role/OtherComprehensiveIncomeTables" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#BalanceSheetOffsetting" roleURI="http://www.cvbfinancialcorp.com/role/BalanceSheetOffsetting" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#BalanceSheetOffsettingTables" roleURI="http://www.cvbfinancialcorp.com/role/BalanceSheetOffsettingTables" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#CondensedFinancialInformationOfParentCompany" roleURI="http://www.cvbfinancialcorp.com/role/CondensedFinancialInformationOfParentCompany" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#CondensedFinancialInformationOfParentCompanyTables" roleURI="http://www.cvbfinancialcorp.com/role/CondensedFinancialInformationOfParentCompanyTables" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#QuarterlyFinancialData" roleURI="http://www.cvbfinancialcorp.com/role/QuarterlyFinancialData" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#QuarterlyFinancialDataTables" roleURI="http://www.cvbfinancialcorp.com/role/QuarterlyFinancialDataTables" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#DerivativeFinancialInstruments" roleURI="http://www.cvbfinancialcorp.com/role/DerivativeFinancialInstruments" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#DerivativeFinancialInstrumentsTables" roleURI="http://www.cvbfinancialcorp.com/role/DerivativeFinancialInstrumentsTables" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#EarningsPerShareReconciliationAdditionalInformationDetail" roleURI="http://www.cvbfinancialcorp.com/role/EarningsPerShareReconciliationAdditionalInformationDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#EarningsPerShareReconciliationScheduleOfEarningsPerCommonShareReconciliationDetail" roleURI="http://www.cvbfinancialcorp.com/role/EarningsPerShareReconciliationScheduleOfEarningsPerCommonShareReconciliationDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#StockBasedCompensationPlansOptionActivityUnderCompanysStockOptionPlansDetail" roleURI="http://www.cvbfinancialcorp.com/role/StockBasedCompensationPlansOptionActivityUnderCompanysStockOptionPlansDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#OtherComprehensiveIncomeSummaryOfComponentsOfOciDetail" roleURI="http://www.cvbfinancialcorp.com/role/OtherComprehensiveIncomeSummaryOfComponentsOfOciDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#QuarterlyFinancialDataSummarizedQuarterlyFinancialDataDetail" roleURI="http://www.cvbfinancialcorp.com/role/QuarterlyFinancialDataSummarizedQuarterlyFinancialDataDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#Business" roleURI="http://www.cvbfinancialcorp.com/role/Business" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#BasisOfPresentation" roleURI="http://www.cvbfinancialcorp.com/role/BasisOfPresentation" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#SummaryOfSignificantAccountingPolicies" roleURI="http://www.cvbfinancialcorp.com/role/SummaryOfSignificantAccountingPolicies" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#SummaryOfSignificantAccountingPoliciesTables" roleURI="http://www.cvbfinancialcorp.com/role/SummaryOfSignificantAccountingPoliciesTables" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#BusinessCombinations" roleURI="http://www.cvbfinancialcorp.com/role/BusinessCombinations" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#InvestmentSecurities" roleURI="http://www.cvbfinancialcorp.com/role/InvestmentSecurities" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#InvestmentSecuritiesTables" roleURI="http://www.cvbfinancialcorp.com/role/InvestmentSecuritiesTables" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#LoansAndLeaseFinanceReceivablesAndAllowanceForCreditLosses" roleURI="http://www.cvbfinancialcorp.com/role/LoansAndLeaseFinanceReceivablesAndAllowanceForCreditLosses" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#LoansAndLeaseFinanceReceivablesAndAllowanceForCreditLossesTables" roleURI="http://www.cvbfinancialcorp.com/role/LoansAndLeaseFinanceReceivablesAndAllowanceForCreditLossesTables" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#OtherRealEstateOwned" roleURI="http://www.cvbfinancialcorp.com/role/OtherRealEstateOwned" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#OtherRealEstateOwnedTables" roleURI="http://www.cvbfinancialcorp.com/role/OtherRealEstateOwnedTables" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#GoodwillAndOtherIntangibleAssets" roleURI="http://www.cvbfinancialcorp.com/role/GoodwillAndOtherIntangibleAssets" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#GoodwillAndOtherIntangibleAssetsTables" roleURI="http://www.cvbfinancialcorp.com/role/GoodwillAndOtherIntangibleAssetsTables" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#DepositsScheduledMaturitiesOfTimeCertificatesOfDepositDetail" roleURI="http://www.cvbfinancialcorp.com/role/DepositsScheduledMaturitiesOfTimeCertificatesOfDepositDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#ConsolidatedBalanceSheets" roleURI="http://www.cvbfinancialcorp.com/role/ConsolidatedBalanceSheets" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#AccountingPoliciesPolicies" roleURI="http://www.cvbfinancialcorp.com/role/AccountingPoliciesPolicies" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#RegulatoryMattersAdditionalInformationDetail" roleURI="http://www.cvbfinancialcorp.com/role/RegulatoryMattersAdditionalInformationDetail" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#ConsolidatedStatementsOfCashFlows" roleURI="http://www.cvbfinancialcorp.com/role/ConsolidatedStatementsOfCashFlows" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#RevenueRecognition" roleURI="http://www.cvbfinancialcorp.com/role/RevenueRecognition" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#RevenueRecognitionTables" roleURI="http://www.cvbfinancialcorp.com/role/RevenueRecognitionTables" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#BusinessCombinationsTables" roleURI="http://www.cvbfinancialcorp.com/role/BusinessCombinationsTables" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#Leases" roleURI="http://www.cvbfinancialcorp.com/role/Leases" />
<roleRef xlink:type="simple" xlink:href="cvbf-20201231.xsd#LeasesTables" roleURI="http://www.cvbfinancialcorp.com/role/LeasesTables" />
<arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all" />
<arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default" />
<arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain" />
<arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member" />
<arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension" />
<arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/notAll" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#notAll" />
<definitionLink xlink:type="extended" xlink:role="http://www.cvbfinancialcorp.com/role/ConsolidatedStatementsOfEarningsAndComprehensiveIncome">
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_81" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_126" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_81" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTax_126" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EarningsPerShareBasic" xlink:label="loc_us-gaap_EarningsPerShareBasic_127" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_81" xlink:to="loc_us-gaap_EarningsPerShareBasic_127" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EarningsPerShareDiluted" xlink:label="loc_us-gaap_EarningsPerShareDiluted_128" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_81" xlink:to="loc_us-gaap_EarningsPerShareDiluted_128" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_123" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_81" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_123" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_124" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_81" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_124" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestAndDividendIncomeOperatingAbstract" xlink:label="loc_us-gaap_InterestAndDividendIncomeOperatingAbstract_73" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_81" xlink:to="loc_us-gaap_InterestAndDividendIncomeOperatingAbstract_73" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DividendIncomeOperating" xlink:label="loc_us-gaap_DividendIncomeOperating_84" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestAndDividendIncomeOperatingAbstract_73" xlink:to="loc_us-gaap_DividendIncomeOperating_84" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestAndDividendIncomeOperating" xlink:label="loc_us-gaap_InterestAndDividendIncomeOperating_86" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestAndDividendIncomeOperatingAbstract_73" xlink:to="loc_us-gaap_InterestAndDividendIncomeOperating_86" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestAndDividendIncomeSecuritiesByTaxableStatusAbstract" xlink:label="loc_us-gaap_InterestAndDividendIncomeSecuritiesByTaxableStatusAbstract_74" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestAndDividendIncomeOperatingAbstract_73" xlink:to="loc_us-gaap_InterestAndDividendIncomeSecuritiesByTaxableStatusAbstract_74" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestIncomeDebtSecuritiesOperating" xlink:label="loc_us-gaap_InterestIncomeDebtSecuritiesOperating_89" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestAndDividendIncomeSecuritiesByTaxableStatusAbstract_74" xlink:to="loc_us-gaap_InterestIncomeDebtSecuritiesOperating_89" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestAndDividendIncomeSecuritiesAvailableForSale" xlink:label="loc_us-gaap_InterestAndDividendIncomeSecuritiesAvailableForSale_87" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestAndDividendIncomeSecuritiesByTaxableStatusAbstract_74" xlink:to="loc_us-gaap_InterestAndDividendIncomeSecuritiesAvailableForSale_87" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestAndDividendIncomeSecuritiesHeldToMaturity" xlink:label="loc_us-gaap_InterestAndDividendIncomeSecuritiesHeldToMaturity_88" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestAndDividendIncomeSecuritiesByTaxableStatusAbstract_74" xlink:to="loc_us-gaap_InterestAndDividendIncomeSecuritiesHeldToMaturity_88" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_InterestEarningDepositsWithOtherInstitutionsAndFederalFundsSold" xlink:label="loc_cvbf_InterestEarningDepositsWithOtherInstitutionsAndFederalFundsSold_85" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestAndDividendIncomeOperatingAbstract_73" xlink:to="loc_cvbf_InterestEarningDepositsWithOtherInstitutionsAndFederalFundsSold_85" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestAndFeeIncomeLoansAndLeasesHeldInPortfolio" xlink:label="loc_us-gaap_InterestAndFeeIncomeLoansAndLeasesHeldInPortfolio_83" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestAndDividendIncomeOperatingAbstract_73" xlink:to="loc_us-gaap_InterestAndFeeIncomeLoansAndLeasesHeldInPortfolio_83" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_125" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_81" xlink:to="loc_us-gaap_NetIncomeLoss_125" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NoninterestExpenseAbstract" xlink:label="loc_us-gaap_NoninterestExpenseAbstract_76" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_81" xlink:to="loc_us-gaap_NoninterestExpenseAbstract_76" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationAcquisitionRelatedCosts" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_101" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_76" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_101" use="optional" order="17" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OccupancyNet" xlink:label="loc_us-gaap_OccupancyNet_95" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_76" xlink:to="loc_us-gaap_OccupancyNet_95" use="optional" order="18" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NoninterestExpense" xlink:label="loc_us-gaap_NoninterestExpense_105" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_76" xlink:to="loc_us-gaap_NoninterestExpense_105" use="optional" order="19" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_MarketingExpense" xlink:label="loc_us-gaap_MarketingExpense_98" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_76" xlink:to="loc_us-gaap_MarketingExpense_98" use="optional" order="20" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LaborAndRelatedExpense" xlink:label="loc_us-gaap_LaborAndRelatedExpense_94" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_76" xlink:to="loc_us-gaap_LaborAndRelatedExpense_94" use="optional" order="21" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AmortizationOfIntangibleAssets" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_100" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_76" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_100" use="optional" order="22" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherNoninterestExpense" xlink:label="loc_us-gaap_OtherNoninterestExpense_104" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_76" xlink:to="loc_us-gaap_OtherNoninterestExpense_104" use="optional" order="23" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProfessionalFees" xlink:label="loc_us-gaap_ProfessionalFees_96" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_76" xlink:to="loc_us-gaap_ProfessionalFees_96" use="optional" order="24" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_IncreaseOrDecreaseInProvisionForUnfundedLoanCommitments" xlink:label="loc_cvbf_IncreaseOrDecreaseInProvisionForUnfundedLoanCommitments_566440" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_76" xlink:to="loc_cvbf_IncreaseOrDecreaseInProvisionForUnfundedLoanCommitments_566440" use="optional" order="25" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_Computersoftwareexpense" xlink:label="loc_cvbf_Computersoftwareexpense_822918" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_76" xlink:to="loc_cvbf_Computersoftwareexpense_822918" use="optional" order="26" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NoninterestIncomeAbstract" xlink:label="loc_us-gaap_NoninterestIncomeAbstract_77" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_81" xlink:to="loc_us-gaap_NoninterestIncomeAbstract_77" use="optional" order="27" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BankOwnedLifeInsuranceIncome" xlink:label="loc_us-gaap_BankOwnedLifeInsuranceIncome_107" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestIncomeAbstract_77" xlink:to="loc_us-gaap_BankOwnedLifeInsuranceIncome_107" use="optional" order="28" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NoninterestIncomeOther" xlink:label="loc_us-gaap_NoninterestIncomeOther_110" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestIncomeAbstract_77" xlink:to="loc_us-gaap_NoninterestIncomeOther_110" use="optional" order="29" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NoninterestIncome" xlink:label="loc_us-gaap_NoninterestIncome_111" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestIncomeAbstract_77" xlink:to="loc_us-gaap_NoninterestIncome_111" use="optional" order="30" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_GainLossOnSaleOfBuilding" xlink:label="loc_cvbf_GainLossOnSaleOfBuilding_417482" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestIncomeAbstract_77" xlink:to="loc_cvbf_GainLossOnSaleOfBuilding_417482" use="optional" order="31" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_106" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestIncomeAbstract_77" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_106" use="optional" order="32" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GainLossOnCondemnation" xlink:label="loc_us-gaap_GainLossOnCondemnation_474430" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestIncomeAbstract_77" xlink:to="loc_us-gaap_GainLossOnCondemnation_474430" use="optional" order="33" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_GainsLossesOnOtherRealEstateNet" xlink:label="loc_cvbf_GainsLossesOnOtherRealEstateNet_519213" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestIncomeAbstract_77" xlink:to="loc_cvbf_GainsLossesOnOtherRealEstateNet_519213" use="optional" order="34" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract_78" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_81" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract_78" use="optional" order="35" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1_113" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract_78" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1_113" use="optional" order="36" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_418432" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract_78" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_418432" use="optional" order="37" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax_457576" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract_78" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax_457576" use="optional" order="38" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax_512842" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract_78" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax_512842" use="optional" order="39" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesTransferredFromAvailableForSaleToHeldToMaturityBeforeTax" xlink:label="loc_cvbf_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesTransferredFromAvailableForSaleToHeldToMaturityBeforeTax_519214" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract_78" xlink:to="loc_cvbf_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesTransferredFromAvailableForSaleToHeldToMaturityBeforeTax_519214" use="optional" order="40" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestExpenseAbstract" xlink:label="loc_us-gaap_InterestExpenseAbstract_75" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_81" xlink:to="loc_us-gaap_InterestExpenseAbstract_75" use="optional" order="41" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestExpense" xlink:label="loc_us-gaap_InterestExpense_93" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestExpenseAbstract_75" xlink:to="loc_us-gaap_InterestExpense_93" use="optional" order="42" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_InterestExpenseBorrowingsAndCustomerRepurchaseAgreements" xlink:label="loc_cvbf_InterestExpenseBorrowingsAndCustomerRepurchaseAgreements_91" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestExpenseAbstract_75" xlink:to="loc_cvbf_InterestExpenseBorrowingsAndCustomerRepurchaseAgreements_91" use="optional" order="43" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestExpenseDeposits" xlink:label="loc_us-gaap_InterestExpenseDeposits_90" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestExpenseAbstract_75" xlink:to="loc_us-gaap_InterestExpenseDeposits_90" use="optional" order="44" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestExpenseSubordinatedNotesAndDebentures" xlink:label="loc_us-gaap_InterestExpenseSubordinatedNotesAndDebentures_92" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestExpenseAbstract_75" xlink:to="loc_us-gaap_InterestExpenseSubordinatedNotesAndDebentures_92" use="optional" order="45" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss" xlink:label="loc_us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_122" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_81" xlink:to="loc_us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_122" use="optional" order="46" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestIncomeExpenseNet" xlink:label="loc_us-gaap_InterestIncomeExpenseNet_120" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_81" xlink:to="loc_us-gaap_InterestIncomeExpenseNet_120" use="optional" order="47" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProvisionForLoanAndLeaseLosses" xlink:label="loc_us-gaap_ProvisionForLoanAndLeaseLosses_121" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_81" xlink:to="loc_us-gaap_ProvisionForLoanAndLeaseLosses_121" use="optional" order="48" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_82" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_81" xlink:to="loc_us-gaap_StatementTable_82" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="49" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ProductOrServiceAxis" xlink:label="loc_srt_ProductOrServiceAxis_79" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_82" xlink:to="loc_srt_ProductOrServiceAxis_79" use="optional" order="50" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ProductsAndServicesDomain" xlink:label="loc_srt_ProductsAndServicesDomain_80" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_79" xlink:to="loc_srt_ProductsAndServicesDomain_80" use="optional" order="51" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ProductsAndServicesDomain" xlink:label="loc_srt_ProductsAndServicesDomain_80_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_79" xlink:to="loc_srt_ProductsAndServicesDomain_80_default" use="optional" order="52" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CreditCardMember" xlink:label="loc_us-gaap_CreditCardMember_119" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_80" xlink:to="loc_us-gaap_CreditCardMember_119" use="optional" order="53" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DepositAccountMember" xlink:label="loc_us-gaap_DepositAccountMember_117" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_80" xlink:to="loc_us-gaap_DepositAccountMember_117" use="optional" order="54" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiduciaryAndTrustMember" xlink:label="loc_us-gaap_FiduciaryAndTrustMember_118" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_80" xlink:to="loc_us-gaap_FiduciaryAndTrustMember_118" use="optional" order="55" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.cvbfinancialcorp.com/role/ConsolidatedStatementsOfStockholdersEquity">
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_136" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DividendsCommonStockCash" xlink:label="loc_us-gaap_DividendsCommonStockCash_155" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_136" xlink:to="loc_us-gaap_DividendsCommonStockCash_155" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_156" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_136" xlink:to="loc_us-gaap_NetIncomeLoss_156" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_157" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_136" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_157" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SharesIssued" xlink:label="loc_us-gaap_SharesIssued_145" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_136" xlink:to="loc_us-gaap_SharesIssued_145" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_137" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_136" xlink:to="loc_us-gaap_StatementTable_137" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_133" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_137" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_133" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_132" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_133" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_132" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_132_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_133" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_132_default" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_CommunityBankMember" xlink:label="loc_cvbf_CommunityBankMember_489745" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_132" xlink:to="loc_cvbf_CommunityBankMember_489745" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_135" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_137" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_135" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_134" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_135" xlink:to="loc_us-gaap_EquityComponentDomain_134" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_134_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_135" xlink:to="loc_us-gaap_EquityComponentDomain_134_default" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember" xlink:label="loc_us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember_139" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_134" xlink:to="loc_us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember_139" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetainedEarningsMember" xlink:label="loc_us-gaap_RetainedEarningsMember_140" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_134" xlink:to="loc_us-gaap_RetainedEarningsMember_140" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_141" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_134" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_141" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RestatementAxis" xlink:label="loc_srt_RestatementAxis_828148" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_137" xlink:to="loc_srt_RestatementAxis_828148" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RestatementDomain" xlink:label="loc_srt_RestatementDomain_828149" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RestatementAxis_828148" xlink:to="loc_srt_RestatementDomain_828149" use="optional" order="17" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RestatementDomain" xlink:label="loc_srt_RestatementDomain_828149_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RestatementAxis_828148" xlink:to="loc_srt_RestatementDomain_828149_default" use="optional" order="18" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RevisionOfPriorPeriodAccountingStandardsUpdateAdjustmentMember" xlink:label="loc_srt_RevisionOfPriorPeriodAccountingStandardsUpdateAdjustmentMember_828150" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RestatementDomain_828149" xlink:to="loc_srt_RevisionOfPriorPeriodAccountingStandardsUpdateAdjustmentMember_828150" use="optional" order="19" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_142" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_136" xlink:to="loc_us-gaap_StockholdersEquity_142" use="optional" order="20" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TaxCutsAndJobsActOf2017ReclassificationFromAociToRetainedEarningsTaxEffect" xlink:label="loc_us-gaap_TaxCutsAndJobsActOf2017ReclassificationFromAociToRetainedEarningsTaxEffect_144" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_136" xlink:to="loc_us-gaap_TaxCutsAndJobsActOf2017ReclassificationFromAociToRetainedEarningsTaxEffect_144" use="optional" order="21" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesAcquisitions" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_149" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_136" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_149" use="optional" order="22" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_154" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_136" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_154" use="optional" order="23" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_150" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_136" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_150" use="optional" order="24" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockRepurchasedDuringPeriodShares" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodShares_147" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_136" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodShares_147" use="optional" order="25" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_153" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_136" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_153" use="optional" order="26" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockRepurchasedDuringPeriodValue" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodValue_146" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_136" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodValue_146" use="optional" order="27" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_151" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_136" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_151" use="optional" order="28" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueAcquisitions" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueAcquisitions_148" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_136" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueAcquisitions_148" use="optional" order="29" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.cvbfinancialcorp.com/role/BusinessAdditionalInformationDetail">
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_ScheduleOfDescriptionOfCompanyLineItems" xlink:label="loc_cvbf_ScheduleOfDescriptionOfCompanyLineItems_233" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_NumberOfInactiveSubsidiaries" xlink:label="loc_cvbf_NumberOfInactiveSubsidiaries_238" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cvbf_ScheduleOfDescriptionOfCompanyLineItems_233" xlink:to="loc_cvbf_NumberOfInactiveSubsidiaries_238" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_BankOperatedBankingCentersNumber" xlink:label="loc_cvbf_BankOperatedBankingCentersNumber_239" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cvbf_ScheduleOfDescriptionOfCompanyLineItems_233" xlink:to="loc_cvbf_BankOperatedBankingCentersNumber_239" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_BankOperatedWealthManagementOfficesNumber" xlink:label="loc_cvbf_BankOperatedWealthManagementOfficesNumber_240" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cvbf_ScheduleOfDescriptionOfCompanyLineItems_233" xlink:to="loc_cvbf_BankOperatedWealthManagementOfficesNumber_240" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_241" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cvbf_ScheduleOfDescriptionOfCompanyLineItems_233" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_241" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_ScheduleOfDescriptionOfCompanyTable" xlink:label="loc_cvbf_ScheduleOfDescriptionOfCompanyTable_234" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_cvbf_ScheduleOfDescriptionOfCompanyLineItems_233" xlink:to="loc_cvbf_ScheduleOfDescriptionOfCompanyTable_234" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_232" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_cvbf_ScheduleOfDescriptionOfCompanyTable_234" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_232" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_231" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_232" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_231" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_231_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_232" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_231_default" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_CommunityBankMember" xlink:label="loc_cvbf_CommunityBankMember_237" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_231" xlink:to="loc_cvbf_CommunityBankMember_237" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_NumberofLoanProductionOffice" xlink:label="loc_cvbf_NumberofLoanProductionOffice_600857" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cvbf_ScheduleOfDescriptionOfCompanyLineItems_233" xlink:to="loc_cvbf_NumberofLoanProductionOffice_600857" use="optional" order="10" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.cvbfinancialcorp.com/role/SummaryOfSignificantAccountingPoliciesAdditionalInformationDetail">
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_SummaryOfSignificantAccountingPoliciesLineItems" xlink:label="loc_cvbf_SummaryOfSignificantAccountingPoliciesLineItems_249" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GoodwillAndIntangibleAssetImpairment" xlink:label="loc_us-gaap_GoodwillAndIntangibleAssetImpairment_275" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cvbf_SummaryOfSignificantAccountingPoliciesLineItems_249" xlink:to="loc_us-gaap_GoodwillAndIntangibleAssetImpairment_275" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_MinimumLoanAmountForAnnualCreditReviewProcess" xlink:label="loc_cvbf_MinimumLoanAmountForAnnualCreditReviewProcess_265" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cvbf_SummaryOfSignificantAccountingPoliciesLineItems_249" xlink:to="loc_cvbf_MinimumLoanAmountForAnnualCreditReviewProcess_265" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NumberOfOperatingSegments" xlink:label="loc_us-gaap_NumberOfOperatingSegments_255" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cvbf_SummaryOfSignificantAccountingPoliciesLineItems_249" xlink:to="loc_us-gaap_NumberOfOperatingSegments_255" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_PeriodForPrincipalOrInterestPaymentOnLoansRemainAccrual" xlink:label="loc_cvbf_PeriodForPrincipalOrInterestPaymentOnLoansRemainAccrual_259" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cvbf_SummaryOfSignificantAccountingPoliciesLineItems_249" xlink:to="loc_cvbf_PeriodForPrincipalOrInterestPaymentOnLoansRemainAccrual_259" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_PeriodOverWhichBorrowerHasToDemonstrateRepaymentPerformanceInComplianceWithRestructuredTermsToTakeLoanOutOfNonaccrualStatus" xlink:label="loc_cvbf_PeriodOverWhichBorrowerHasToDemonstrateRepaymentPerformanceInComplianceWithRestructuredTermsToTakeLoanOutOfNonaccrualStatus_261" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cvbf_SummaryOfSignificantAccountingPoliciesLineItems_249" xlink:to="loc_cvbf_PeriodOverWhichBorrowerHasToDemonstrateRepaymentPerformanceInComplianceWithRestructuredTermsToTakeLoanOutOfNonaccrualStatus_261" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_PeriodWhenCollectionOfInterestOnPrincipalIsNoLongerProbable" xlink:label="loc_cvbf_PeriodWhenCollectionOfInterestOnPrincipalIsNoLongerProbable_260" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cvbf_SummaryOfSignificantAccountingPoliciesLineItems_249" xlink:to="loc_cvbf_PeriodWhenCollectionOfInterestOnPrincipalIsNoLongerProbable_260" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_PeriodWhenPrincipalOrInterestPaymentArePastDueToConsiderLoans" xlink:label="loc_cvbf_PeriodWhenPrincipalOrInterestPaymentArePastDueToConsiderLoans_258" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cvbf_SummaryOfSignificantAccountingPoliciesLineItems_249" xlink:to="loc_cvbf_PeriodWhenPrincipalOrInterestPaymentArePastDueToConsiderLoans_258" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_PeriodWhichChargeOffsUnsecuredConsumerLoanAreRecorded" xlink:label="loc_cvbf_PeriodWhichChargeOffsUnsecuredConsumerLoanAreRecorded_264" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cvbf_SummaryOfSignificantAccountingPoliciesLineItems_249" xlink:to="loc_cvbf_PeriodWhichChargeOffsUnsecuredConsumerLoanAreRecorded_264" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_SummaryOfSignificantAccountingPoliciesTable" xlink:label="loc_cvbf_SummaryOfSignificantAccountingPoliciesTable_250" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_cvbf_SummaryOfSignificantAccountingPoliciesLineItems_249" xlink:to="loc_cvbf_SummaryOfSignificantAccountingPoliciesTable_250" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AdjustmentsForNewAccountingPronouncementsAxis" xlink:label="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_245" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_cvbf_SummaryOfSignificantAccountingPoliciesTable_250" xlink:to="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_245" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TypeOfAdoptionMember" xlink:label="loc_us-gaap_TypeOfAdoptionMember_252" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_245" xlink:to="loc_us-gaap_TypeOfAdoptionMember_252" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TypeOfAdoptionMember" xlink:label="loc_us-gaap_TypeOfAdoptionMember_252_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_245" xlink:to="loc_us-gaap_TypeOfAdoptionMember_252_default" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancialInstrumentAxis" xlink:label="loc_us-gaap_FinancialInstrumentAxis_246" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_cvbf_SummaryOfSignificantAccountingPoliciesTable_250" xlink:to="loc_us-gaap_FinancialInstrumentAxis_246" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_251" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_246" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_251" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_251_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_246" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_251_default" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeAxis" xlink:label="loc_srt_RangeAxis_247" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_cvbf_SummaryOfSignificantAccountingPoliciesTable_250" xlink:to="loc_srt_RangeAxis_247" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_248" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_247" xlink:to="loc_srt_RangeMember_248" use="optional" order="17" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_248_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_247" xlink:to="loc_srt_RangeMember_248_default" use="optional" order="18" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MaximumMember" xlink:label="loc_srt_MaximumMember_254" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_248" xlink:to="loc_srt_MaximumMember_254" use="optional" order="19" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MinimumMember" xlink:label="loc_srt_MinimumMember_253" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_248" xlink:to="loc_srt_MinimumMember_253" use="optional" order="20" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RestatementAxis" xlink:label="loc_srt_RestatementAxis_823077" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_cvbf_SummaryOfSignificantAccountingPoliciesTable_250" xlink:to="loc_srt_RestatementAxis_823077" use="optional" order="21" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RestatementDomain" xlink:label="loc_srt_RestatementDomain_823078" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RestatementAxis_823077" xlink:to="loc_srt_RestatementDomain_823078" use="optional" order="22" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RestatementDomain" xlink:label="loc_srt_RestatementDomain_823078_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RestatementAxis_823077" xlink:to="loc_srt_RestatementDomain_823078_default" use="optional" order="23" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RevisionOfPriorPeriodAccountingStandardsUpdateAdjustmentMember" xlink:label="loc_srt_RevisionOfPriorPeriodAccountingStandardsUpdateAdjustmentMember_823080" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RestatementDomain_823078" xlink:to="loc_srt_RevisionOfPriorPeriodAccountingStandardsUpdateAdjustmentMember_823080" use="optional" order="24" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_AdjustmentOfTransitionReserveForLoans" xlink:label="loc_cvbf_AdjustmentOfTransitionReserveForLoans_823060" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cvbf_SummaryOfSignificantAccountingPoliciesLineItems_249" xlink:to="loc_cvbf_AdjustmentOfTransitionReserveForLoans_823060" use="optional" order="25" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_AdjustmentOfTransitionAllowanceForCreditLosesForLoans" xlink:label="loc_cvbf_AdjustmentOfTransitionAllowanceForCreditLosesForLoans_823061" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cvbf_SummaryOfSignificantAccountingPoliciesLineItems_249" xlink:to="loc_cvbf_AdjustmentOfTransitionAllowanceForCreditLosesForLoans_823061" use="optional" order="26" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_823063" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cvbf_SummaryOfSignificantAccountingPoliciesLineItems_249" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_823063" use="optional" order="27" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.cvbfinancialcorp.com/role/SummaryOfSignificantAccountingPoliciesSummaryOfUsefulLivesOfPrincipalClassesOfAssetsDetail">
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_286" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_290" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_286" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_290" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_285" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_290" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_285" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_287" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_285" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_287" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_287_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_285" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_287_default" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BuildingAndBuildingImprovementsMember" xlink:label="loc_us-gaap_BuildingAndBuildingImprovementsMember_293" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_287" xlink:to="loc_us-gaap_BuildingAndBuildingImprovementsMember_293" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ComputerEquipmentMember" xlink:label="loc_us-gaap_ComputerEquipmentMember_294" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_287" xlink:to="loc_us-gaap_ComputerEquipmentMember_294" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FurnitureAndFixturesMember" xlink:label="loc_us-gaap_FurnitureAndFixturesMember_295" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_287" xlink:to="loc_us-gaap_FurnitureAndFixturesMember_295" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeAxis" xlink:label="loc_srt_RangeAxis_288" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_290" xlink:to="loc_srt_RangeAxis_288" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_289" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_288" xlink:to="loc_srt_RangeMember_289" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_289_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_288" xlink:to="loc_srt_RangeMember_289_default" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MaximumMember" xlink:label="loc_srt_MaximumMember_297" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_289" xlink:to="loc_srt_MaximumMember_297" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MinimumMember" xlink:label="loc_srt_MinimumMember_296" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_289" xlink:to="loc_srt_MinimumMember_296" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_387169" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_290" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_387169" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_387170" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_387169" xlink:to="loc_us-gaap_EquityComponentDomain_387170" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_387170_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_387169" xlink:to="loc_us-gaap_EquityComponentDomain_387170_default" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_PropertyPlantAndEquipmentUsefulLifeLeaseHoldImprovements" xlink:label="loc_cvbf_PropertyPlantAndEquipmentUsefulLifeLeaseHoldImprovements_292" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_286" xlink:to="loc_cvbf_PropertyPlantAndEquipmentUsefulLifeLeaseHoldImprovements_292" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_291" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_286" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_291" use="optional" order="17" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.cvbfinancialcorp.com/role/BusinessCombinationsAdditionalInformationDetail">
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_302" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionEffectiveDateOfAcquisition1" xlink:label="loc_us-gaap_BusinessAcquisitionEffectiveDateOfAcquisition1_308" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_302" xlink:to="loc_us-gaap_BusinessAcquisitionEffectiveDateOfAcquisition1_308" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationAcquisitionRelatedCosts" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_325" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_302" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_325" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_311" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_302" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_311" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_312" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_302" xlink:to="loc_us-gaap_Goodwill_312" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_NumberOfBranches" xlink:label="loc_cvbf_NumberOfBranches_309" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_302" xlink:to="loc_cvbf_NumberOfBranches_309" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesGross" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_310" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_302" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_310" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPremiumPaid" xlink:label="loc_cvbf_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPremiumPaid_313" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_302" xlink:to="loc_cvbf_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPremiumPaid_313" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_PercentageOfCoreDepositsToTotalDeposits" xlink:label="loc_cvbf_PercentageOfCoreDepositsToTotalDeposits_314" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_302" xlink:to="loc_cvbf_PercentageOfCoreDepositsToTotalDeposits_314" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_303" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_302" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_303" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_301" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_303" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_301" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_300" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_301" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_300" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_300_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_301" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_300_default" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_CommunityBankMember" xlink:label="loc_cvbf_CommunityBankMember_306" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_300" xlink:to="loc_cvbf_CommunityBankMember_306" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquitySecuritiesByIndustryAxis" xlink:label="loc_us-gaap_EquitySecuritiesByIndustryAxis_513691" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_303" xlink:to="loc_us-gaap_EquitySecuritiesByIndustryAxis_513691" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquitySecuritiesIndustryMember" xlink:label="loc_us-gaap_EquitySecuritiesIndustryMember_513692" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_EquitySecuritiesByIndustryAxis_513691" xlink:to="loc_us-gaap_EquitySecuritiesIndustryMember_513692" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquitySecuritiesIndustryMember" xlink:label="loc_us-gaap_EquitySecuritiesIndustryMember_513692_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_EquitySecuritiesByIndustryAxis_513691" xlink:to="loc_us-gaap_EquitySecuritiesIndustryMember_513692_default" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_EntityLocationTypeAxis" xlink:label="loc_cvbf_EntityLocationTypeAxis_513697" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_303" xlink:to="loc_cvbf_EntityLocationTypeAxis_513697" use="optional" order="17" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_EntityLocationTypeDomain" xlink:label="loc_cvbf_EntityLocationTypeDomain_513698" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_cvbf_EntityLocationTypeAxis_513697" xlink:to="loc_cvbf_EntityLocationTypeDomain_513698" use="optional" order="18" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_EntityLocationTypeDomain" xlink:label="loc_cvbf_EntityLocationTypeDomain_513698_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_cvbf_EntityLocationTypeAxis_513697" xlink:to="loc_cvbf_EntityLocationTypeDomain_513698_default" use="optional" order="19" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationAcquiredReceivablesGrossContractualAmount" xlink:label="loc_us-gaap_BusinessCombinationAcquiredReceivablesGrossContractualAmount_327336" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_302" xlink:to="loc_us-gaap_BusinessCombinationAcquiredReceivablesGrossContractualAmount_327336" use="optional" order="20" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationAcquiredReceivablesEstimatedUncollectible" xlink:label="loc_us-gaap_BusinessCombinationAcquiredReceivablesEstimatedUncollectible_327337" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_302" xlink:to="loc_us-gaap_BusinessCombinationAcquiredReceivablesEstimatedUncollectible_327337" use="optional" order="21" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.cvbfinancialcorp.com/role/BusinessCombinaionsScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedDetail">
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_326646" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_326641" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_326646" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_326641" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_326642" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_326641" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_326642" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_326643" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_326642" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_326643" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_326643_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_326642" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_326643_default" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_CommunityBankMember" xlink:label="loc_cvbf_CommunityBankMember_326645" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_326643" xlink:to="loc_cvbf_CommunityBankMember_326645" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_326671" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_326646" xlink:to="loc_us-gaap_Goodwill_326671" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferredAbstract" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredAbstract_326647" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_326646" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredAbstract_326647" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesGross" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_326648" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationConsiderationTransferredAbstract_326647" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_326648" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_326649" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationConsiderationTransferredAbstract_326647" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_326649" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferred1" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_326650" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationConsiderationTransferredAbstract_326647" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_326650" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_326651" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_326646" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_326651" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_326663" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_326651" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_326663" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeposits" xlink:label="loc_cvbf_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeposits_326665" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_326663" xlink:to="loc_cvbf_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeposits_326665" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt_326667" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_326663" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt_326667" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_326668" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_326663" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_326668" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_326669" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_326663" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_326669" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAdvances" xlink:label="loc_cvbf_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAdvances_327832" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_326663" xlink:to="loc_cvbf_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAdvances_327832" use="optional" order="17" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_326670" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_326651" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_326670" use="optional" order="18" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_326652" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_326651" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_326652" use="optional" order="19" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPremiumPaid" xlink:label="loc_cvbf_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPremiumPaid_326660" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_326652" xlink:to="loc_cvbf_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPremiumPaid_326660" use="optional" order="20" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_326661" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_326652" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_326661" use="optional" order="21" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsIncludingGoodwill" xlink:label="loc_cvbf_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsIncludingGoodwill_326662" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_326652" xlink:to="loc_cvbf_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsIncludingGoodwill_326662" use="optional" order="22" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBankOwnedLifeInsurance" xlink:label="loc_cvbf_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBankOwnedLifeInsurance_326659" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_326652" xlink:to="loc_cvbf_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBankOwnedLifeInsurance_326659" use="optional" order="23" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedInterestReceivable" xlink:label="loc_cvbf_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedInterestReceivable_327836" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_326652" xlink:to="loc_cvbf_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedInterestReceivable_327836" use="optional" order="24" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_326655" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_326652" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_326655" use="optional" order="25" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_326653" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_326652" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_326653" use="optional" order="26" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsMarketableSecurities" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsMarketableSecurities_326654" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_326652" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsMarketableSecurities_326654" use="optional" order="27" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_326656" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_326652" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_326656" use="optional" order="28" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedEquipment" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedEquipment_326658" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_326652" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedEquipment_326658" use="optional" order="29" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.cvbfinancialcorp.com/role/BusinessCombinationsBusinessAcquisitionProFormaInformationDetail">
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_BusinessAcquisitionsProFormaInformationLineItems" xlink:label="loc_cvbf_BusinessAcquisitionsProFormaInformationLineItems_326629" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_BusinessAcquisitionsProFormaInformationTable" xlink:label="loc_cvbf_BusinessAcquisitionsProFormaInformationTable_326625" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_cvbf_BusinessAcquisitionsProFormaInformationLineItems_326629" xlink:to="loc_cvbf_BusinessAcquisitionsProFormaInformationTable_326625" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_326634" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_cvbf_BusinessAcquisitionsProFormaInformationTable_326625" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_326634" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_326635" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_326634" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_326635" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_326635_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_326634" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_326635_default" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_CommunityBankMember" xlink:label="loc_cvbf_CommunityBankMember_326637" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_326635" xlink:to="loc_cvbf_CommunityBankMember_326637" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionsProFormaRevenue" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_326630" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cvbf_BusinessAcquisitionsProFormaInformationLineItems_326629" xlink:to="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_326630" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss_326631" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cvbf_BusinessAcquisitionsProFormaInformationLineItems_326629" xlink:to="loc_us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss_326631" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic" xlink:label="loc_us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic_326632" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cvbf_BusinessAcquisitionsProFormaInformationLineItems_326629" xlink:to="loc_us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic_326632" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted" xlink:label="loc_us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted_326633" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cvbf_BusinessAcquisitionsProFormaInformationLineItems_326629" xlink:to="loc_us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted_326633" use="optional" order="9" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.cvbfinancialcorp.com/role/InvestmentSecuritiesSummaryOfAmortizedCostAndEstimatedFairValueOfInvestmentSecuritiesDetail">
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfInvestmentsLineItems" xlink:label="loc_us-gaap_ScheduleOfInvestmentsLineItems_332" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain_342" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_332" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain_342" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_337" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_332" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_337" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_338" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_332" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_338" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_336" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_332" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_336" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_339" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_332" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_339" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_AvailableForSaleSecuritiesPortfolioPercentage" xlink:label="loc_cvbf_AvailableForSaleSecuritiesPortfolioPercentage_340" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_332" xlink:to="loc_cvbf_AvailableForSaleSecuritiesPortfolioPercentage_340" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HeldToMaturitySecurities" xlink:label="loc_us-gaap_HeldToMaturitySecurities_341" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_332" xlink:to="loc_us-gaap_HeldToMaturitySecurities_341" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HeldToMaturitySecuritiesFairValue" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesFairValue_344" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_332" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesFairValue_344" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_HeldToMaturitySecuritiesPortfolioPercentage" xlink:label="loc_cvbf_HeldToMaturitySecuritiesPortfolioPercentage_345" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_332" xlink:to="loc_cvbf_HeldToMaturitySecuritiesPortfolioPercentage_345" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfInvestmentsTable" xlink:label="loc_us-gaap_ScheduleOfInvestmentsTable_333" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_332" xlink:to="loc_us-gaap_ScheduleOfInvestmentsTable_333" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancialInstrumentAxis" xlink:label="loc_us-gaap_FinancialInstrumentAxis_329" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_333" xlink:to="loc_us-gaap_FinancialInstrumentAxis_329" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_334" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_329" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_334" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_334_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_329" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_334_default" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherDebtSecuritiesMember" xlink:label="loc_us-gaap_OtherDebtSecuritiesMember_349" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_334" xlink:to="loc_us-gaap_OtherDebtSecuritiesMember_349" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_USGovernmentAgenciesDebtSecuritiesMember" xlink:label="loc_us-gaap_USGovernmentAgenciesDebtSecuritiesMember_346" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_334" xlink:to="loc_us-gaap_USGovernmentAgenciesDebtSecuritiesMember_346" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_USStatesAndPoliticalSubdivisionsMember" xlink:label="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_348" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_334" xlink:to="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_348" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_MortgageBackedSecuritiesMember" xlink:label="loc_us-gaap_MortgageBackedSecuritiesMember_347" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_334" xlink:to="loc_us-gaap_MortgageBackedSecuritiesMember_347" use="optional" order="17" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InvestmentTypeAxis" xlink:label="loc_us-gaap_InvestmentTypeAxis_330" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_333" xlink:to="loc_us-gaap_InvestmentTypeAxis_330" use="optional" order="18" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_331" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_330" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_331" use="optional" order="19" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_331_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_330" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_331_default" use="optional" order="20" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CollateralizedMortgageObligationsMember" xlink:label="loc_us-gaap_CollateralizedMortgageObligationsMember_335" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_331" xlink:to="loc_us-gaap_CollateralizedMortgageObligationsMember_335" use="optional" order="21" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss_343" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_332" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss_343" use="optional" order="22" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.cvbfinancialcorp.com/role/InvestmentSecuritiesSummaryOfInterestIncomeEarnedOnInvestmentSecuritiesDetail">
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems" xlink:label="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems_354" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestAndDividendIncomeSecuritiesHeldToMaturity" xlink:label="loc_us-gaap_InterestAndDividendIncomeSecuritiesHeldToMaturity_361" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems_354" xlink:to="loc_us-gaap_InterestAndDividendIncomeSecuritiesHeldToMaturity_361" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestIncomeSecuritiesTaxable" xlink:label="loc_us-gaap_InterestIncomeSecuritiesTaxable_358" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems_354" xlink:to="loc_us-gaap_InterestIncomeSecuritiesTaxable_358" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestAndDividendIncomeSecurities" xlink:label="loc_us-gaap_InterestAndDividendIncomeSecurities_362" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems_354" xlink:to="loc_us-gaap_InterestAndDividendIncomeSecurities_362" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestAndDividendIncomeSecuritiesAvailableForSale" xlink:label="loc_us-gaap_InterestAndDividendIncomeSecuritiesAvailableForSale_360" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems_354" xlink:to="loc_us-gaap_InterestAndDividendIncomeSecuritiesAvailableForSale_360" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestIncomeSecuritiesTaxAdvantaged" xlink:label="loc_us-gaap_InterestIncomeSecuritiesTaxAdvantaged_359" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems_354" xlink:to="loc_us-gaap_InterestIncomeSecuritiesTaxAdvantaged_359" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryTable" xlink:label="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryTable_355" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems_354" xlink:to="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryTable_355" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InformationByCategoryOfDebtSecurityAxis" xlink:label="loc_us-gaap_InformationByCategoryOfDebtSecurityAxis_352" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryTable_355" xlink:to="loc_us-gaap_InformationByCategoryOfDebtSecurityAxis_352" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCategoriesOfInvestmentsDomain" xlink:label="loc_us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCategoriesOfInvestmentsDomain_353" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InformationByCategoryOfDebtSecurityAxis_352" xlink:to="loc_us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCategoriesOfInvestmentsDomain_353" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCategoriesOfInvestmentsDomain" xlink:label="loc_us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCategoriesOfInvestmentsDomain_353_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InformationByCategoryOfDebtSecurityAxis_352" xlink:to="loc_us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCategoriesOfInvestmentsDomain_353_default" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableforsaleSecuritiesMember" xlink:label="loc_us-gaap_AvailableforsaleSecuritiesMember_356" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCategoriesOfInvestmentsDomain_353" xlink:to="loc_us-gaap_AvailableforsaleSecuritiesMember_356" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HeldtomaturitySecuritiesMember" xlink:label="loc_us-gaap_HeldtomaturitySecuritiesMember_357" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCategoriesOfInvestmentsDomain_353" xlink:to="loc_us-gaap_HeldtomaturitySecuritiesMember_357" use="optional" order="11" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.cvbfinancialcorp.com/role/InvestmentSecuritiesSummaryOfContinuousUnrealizedLossPositionOfSecuritiesDetail">
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfInvestmentsLineItems" xlink:label="loc_us-gaap_ScheduleOfInvestmentsLineItems_389" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_396" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_389" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_396" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss_398" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_389" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss_398" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_394" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_389" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_394" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_400" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_389" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_400" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_402" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_389" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_402" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAccumulatedLoss" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAccumulatedLoss_404" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_389" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAccumulatedLoss_404" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue_514895" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_389" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue_514895" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfInvestmentsTable" xlink:label="loc_us-gaap_ScheduleOfInvestmentsTable_390" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_389" xlink:to="loc_us-gaap_ScheduleOfInvestmentsTable_390" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancialInstrumentAxis" xlink:label="loc_us-gaap_FinancialInstrumentAxis_386" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_390" xlink:to="loc_us-gaap_FinancialInstrumentAxis_386" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_391" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_386" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_391" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_391_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_386" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_391_default" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_USGovernmentAgenciesDebtSecuritiesMember" xlink:label="loc_us-gaap_USGovernmentAgenciesDebtSecuritiesMember_405" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_391" xlink:to="loc_us-gaap_USGovernmentAgenciesDebtSecuritiesMember_405" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_USStatesAndPoliticalSubdivisionsMember" xlink:label="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_407" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_391" xlink:to="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_407" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_MortgageBackedSecuritiesMember" xlink:label="loc_us-gaap_MortgageBackedSecuritiesMember_406" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_391" xlink:to="loc_us-gaap_MortgageBackedSecuritiesMember_406" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InvestmentTypeAxis" xlink:label="loc_us-gaap_InvestmentTypeAxis_387" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_390" xlink:to="loc_us-gaap_InvestmentTypeAxis_387" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_388" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_387" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_388" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_388_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_387" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_388_default" use="optional" order="17" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CollateralizedMortgageObligationsMember" xlink:label="loc_us-gaap_CollateralizedMortgageObligationsMember_392" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_388" xlink:to="loc_us-gaap_CollateralizedMortgageObligationsMember_392" use="optional" order="18" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue_514897" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_389" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue_514897" use="optional" order="19" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue_514898" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_389" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue_514898" use="optional" order="20" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue_514899" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_389" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue_514899" use="optional" order="21" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue_514900" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_389" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue_514900" use="optional" order="22" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue_514896" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_389" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue_514896" use="optional" order="23" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.cvbfinancialcorp.com/role/InvestmentSecuritiesAdditionalInformationDetail">
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_368" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtSecuritiesAvailableForSaleRestricted" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleRestricted_379" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_368" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleRestricted_379" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParentHeldtomaturitySecurities" xlink:label="loc_us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParentHeldtomaturitySecurities_378" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_368" xlink:to="loc_us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParentHeldtomaturitySecurities_378" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxAvailableforsaleDebtSecurities" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxAvailableforsaleDebtSecurities_380" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_368" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxAvailableforsaleDebtSecurities_380" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_AverageLifeOfInvestmentGradeDebtSecurities" xlink:label="loc_cvbf_AverageLifeOfInvestmentGradeDebtSecurities_377" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_368" xlink:to="loc_cvbf_AverageLifeOfInvestmentGradeDebtSecurities_377" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_InvestmentContractualCashFlowsGuaranteedByGovernment" xlink:label="loc_cvbf_InvestmentContractualCashFlowsGuaranteedByGovernment_376" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_368" xlink:to="loc_cvbf_InvestmentContractualCashFlowsGuaranteedByGovernment_376" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesTable" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_369" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_368" xlink:to="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_369" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancialInstrumentAxis" xlink:label="loc_us-gaap_FinancialInstrumentAxis_365" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_369" xlink:to="loc_us-gaap_FinancialInstrumentAxis_365" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_372" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_365" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_372" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_372_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_365" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_372_default" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_USStatesAndPoliticalSubdivisionsMember" xlink:label="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_382" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_372" xlink:to="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_382" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_StatementGeographicalAxis" xlink:label="loc_srt_StatementGeographicalAxis_371" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_369" xlink:to="loc_srt_StatementGeographicalAxis_371" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_SegmentGeographicalDomain" xlink:label="loc_srt_SegmentGeographicalDomain_370" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_371" xlink:to="loc_srt_SegmentGeographicalDomain_370" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_SegmentGeographicalDomain" xlink:label="loc_srt_SegmentGeographicalDomain_370_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_371" xlink:to="loc_srt_SegmentGeographicalDomain_370_default" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2020/country-2020-01-31.xsd#country_US" xlink:label="loc_country_US_381" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_370" xlink:to="loc_country_US_381" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InvestmentTypeAxis" xlink:label="loc_us-gaap_InvestmentTypeAxis_366" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_369" xlink:to="loc_us-gaap_InvestmentTypeAxis_366" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_367" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_366" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_367" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_367_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_366" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_367_default" use="optional" order="17" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CollateralizedMortgageObligationsMember" xlink:label="loc_us-gaap_CollateralizedMortgageObligationsMember_373" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_367" xlink:to="loc_us-gaap_CollateralizedMortgageObligationsMember_373" use="optional" order="18" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_MunicipalBondsMember" xlink:label="loc_us-gaap_MunicipalBondsMember_332346" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_367" xlink:to="loc_us-gaap_MunicipalBondsMember_332346" use="optional" order="19" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_SecuritiesIssuedByGovernmentOrGovernmentSponsoredAgenciesAndEnterprisesPercentage" xlink:label="loc_cvbf_SecuritiesIssuedByGovernmentOrGovernmentSponsoredAgenciesAndEnterprisesPercentage_374" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_368" xlink:to="loc_cvbf_SecuritiesIssuedByGovernmentOrGovernmentSponsoredAgenciesAndEnterprisesPercentage_374" use="optional" order="20" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_PercentageOfTotalInvestmentPortfolioRepresentingMunicipalBonds" xlink:label="loc_cvbf_PercentageOfTotalInvestmentPortfolioRepresentingMunicipalBonds_332343" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_368" xlink:to="loc_cvbf_PercentageOfTotalInvestmentPortfolioRepresentingMunicipalBonds_332343" use="optional" order="21" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_DebtSecuritiesWeightedAverageRemainingContractualMaturityTerm" xlink:label="loc_cvbf_DebtSecuritiesWeightedAverageRemainingContractualMaturityTerm_824361" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_368" xlink:to="loc_cvbf_DebtSecuritiesWeightedAverageRemainingContractualMaturityTerm_824361" use="optional" order="22" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.cvbfinancialcorp.com/role/LoansAndLeaseFinanceReceivablesAndAllowanceForCreditLossesAdditionalInformationDetail">
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsNotesAndLoansReceivableLineItems" xlink:label="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_505" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1" xlink:label="loc_us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1_823855" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_505" xlink:to="loc_us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1_823855" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_LoansClassifiedAsTroubledDebtRestructured" xlink:label="loc_cvbf_LoansClassifiedAsTroubledDebtRestructured_529" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_505" xlink:to="loc_cvbf_LoansClassifiedAsTroubledDebtRestructured_529" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ImpairedFinancingReceivableRecordedInvestment" xlink:label="loc_us-gaap_ImpairedFinancingReceivableRecordedInvestment_527" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_505" xlink:to="loc_us-gaap_ImpairedFinancingReceivableRecordedInvestment_527" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LoansPledgedAsCollateral" xlink:label="loc_us-gaap_LoansPledgedAsCollateral_525" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_505" xlink:to="loc_us-gaap_LoansPledgedAsCollateral_525" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LoansReceivableHeldForSaleAmount" xlink:label="loc_us-gaap_LoansReceivableHeldForSaleAmount_526" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_505" xlink:to="loc_us-gaap_LoansReceivableHeldForSaleAmount_526" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_LoansReceivablePercentageOfPortfolio" xlink:label="loc_cvbf_LoansReceivablePercentageOfPortfolio_521" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_505" xlink:to="loc_cvbf_LoansReceivablePercentageOfPortfolio_521" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_ReserveForUndisbursedCommitments" xlink:label="loc_cvbf_ReserveForUndisbursedCommitments_533" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_505" xlink:to="loc_cvbf_ReserveForUndisbursedCommitments_533" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable" xlink:label="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_519" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_505" xlink:to="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_519" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancialInstrumentAxis" xlink:label="loc_us-gaap_FinancialInstrumentAxis_509" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_519" xlink:to="loc_us-gaap_FinancialInstrumentAxis_509" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_520" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_509" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_520" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_520_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_509" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_520_default" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_SecuredByFarmLandMember" xlink:label="loc_cvbf_SecuredByFarmLandMember_560" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_520" xlink:to="loc_cvbf_SecuredByFarmLandMember_560" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_508" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_519" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_508" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_507" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_508" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_507" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_507_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_508" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_507_default" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis" xlink:label="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_506" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_519" xlink:to="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_506" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ReceivableTypeDomain" xlink:label="loc_us-gaap_ReceivableTypeDomain_518" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_506" xlink:to="loc_us-gaap_ReceivableTypeDomain_518" use="optional" order="17" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ReceivableTypeDomain" xlink:label="loc_us-gaap_ReceivableTypeDomain_518_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_506" xlink:to="loc_us-gaap_ReceivableTypeDomain_518_default" use="optional" order="18" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_LoansExcludingPurchasedCreditImpairedLoansMember" xlink:label="loc_cvbf_LoansExcludingPurchasedCreditImpairedLoansMember_559" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReceivableTypeDomain_518" xlink:to="loc_cvbf_LoansExcludingPurchasedCreditImpairedLoansMember_559" use="optional" order="19" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_510" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_519" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_510" use="optional" order="20" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_511" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_510" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_511" use="optional" order="21" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_511_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_510" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_511_default" use="optional" order="22" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_512" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_519" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_512" use="optional" order="23" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_513" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_512" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_513" use="optional" order="24" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_513_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_512" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_513_default" use="optional" order="25" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_AgribusinessMember" xlink:label="loc_cvbf_AgribusinessMember_545" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_513" xlink:to="loc_cvbf_AgribusinessMember_545" use="optional" order="26" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_DairyAndLivestockLoansMember" xlink:label="loc_cvbf_DairyAndLivestockLoansMember_544" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_513" xlink:to="loc_cvbf_DairyAndLivestockLoansMember_544" use="optional" order="27" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_CommercialAndIndustrialLoansMember" xlink:label="loc_cvbf_CommercialAndIndustrialLoansMember_551" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_513" xlink:to="loc_cvbf_CommercialAndIndustrialLoansMember_551" use="optional" order="28" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommercialRealEstateMember" xlink:label="loc_us-gaap_CommercialRealEstateMember_553" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_513" xlink:to="loc_us-gaap_CommercialRealEstateMember_553" use="optional" order="29" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ConstructionLoansMember" xlink:label="loc_us-gaap_ConstructionLoansMember_543" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_513" xlink:to="loc_us-gaap_ConstructionLoansMember_543" use="optional" order="30" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RealEstateLoanMember" xlink:label="loc_us-gaap_RealEstateLoanMember_542" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_513" xlink:to="loc_us-gaap_RealEstateLoanMember_542" use="optional" order="31" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_SingleFamilyResidentialLoanMember" xlink:label="loc_cvbf_SingleFamilyResidentialLoanMember_550" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_513" xlink:to="loc_cvbf_SingleFamilyResidentialLoanMember_550" use="optional" order="32" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InternalCreditAssessmentAxis" xlink:label="loc_us-gaap_InternalCreditAssessmentAxis_514" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_519" xlink:to="loc_us-gaap_InternalCreditAssessmentAxis_514" use="optional" order="33" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InternalCreditAssessmentDomain" xlink:label="loc_us-gaap_InternalCreditAssessmentDomain_515" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InternalCreditAssessmentAxis_514" xlink:to="loc_us-gaap_InternalCreditAssessmentDomain_515" use="optional" order="34" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InternalCreditAssessmentDomain" xlink:label="loc_us-gaap_InternalCreditAssessmentDomain_515_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InternalCreditAssessmentAxis_514" xlink:to="loc_us-gaap_InternalCreditAssessmentDomain_515_default" use="optional" order="35" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PerformingFinancingReceivableMember" xlink:label="loc_us-gaap_PerformingFinancingReceivableMember_555" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InternalCreditAssessmentDomain_515" xlink:to="loc_us-gaap_PerformingFinancingReceivableMember_555" use="optional" order="36" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_MajorPropertyClassAxis" xlink:label="loc_us-gaap_MajorPropertyClassAxis_516" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_519" xlink:to="loc_us-gaap_MajorPropertyClassAxis_516" use="optional" order="37" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_MajorPropertyClassDomain" xlink:label="loc_us-gaap_MajorPropertyClassDomain_517" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MajorPropertyClassAxis_516" xlink:to="loc_us-gaap_MajorPropertyClassDomain_517" use="optional" order="38" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_MajorPropertyClassDomain" xlink:label="loc_us-gaap_MajorPropertyClassDomain_517_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MajorPropertyClassAxis_516" xlink:to="loc_us-gaap_MajorPropertyClassDomain_517_default" use="optional" order="39" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_SecuredByDairyAndLiveStockLandMember" xlink:label="loc_cvbf_SecuredByDairyAndLiveStockLandMember_557" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MajorPropertyClassDomain_517" xlink:to="loc_cvbf_SecuredByDairyAndLiveStockLandMember_557" use="optional" order="40" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_SecuredByAgriculturalLandMember" xlink:label="loc_cvbf_SecuredByAgriculturalLandMember_558" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MajorPropertyClassDomain_517" xlink:to="loc_cvbf_SecuredByAgriculturalLandMember_558" use="optional" order="41" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CreditLossStatusAxis" xlink:label="loc_us-gaap_CreditLossStatusAxis_474452" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_519" xlink:to="loc_us-gaap_CreditLossStatusAxis_474452" use="optional" order="42" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CreditLossStatusDomain" xlink:label="loc_us-gaap_CreditLossStatusDomain_474453" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditLossStatusAxis_474452" xlink:to="loc_us-gaap_CreditLossStatusDomain_474453" use="optional" order="43" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CreditLossStatusDomain" xlink:label="loc_us-gaap_CreditLossStatusDomain_474453_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditLossStatusAxis_474452" xlink:to="loc_us-gaap_CreditLossStatusDomain_474453_default" use="optional" order="44" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AdjustmentsForNewAccountingPronouncementsAxis" xlink:label="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_823872" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_519" xlink:to="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_823872" use="optional" order="45" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TypeOfAdoptionMember" xlink:label="loc_us-gaap_TypeOfAdoptionMember_823874" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_823872" xlink:to="loc_us-gaap_TypeOfAdoptionMember_823874" use="optional" order="46" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TypeOfAdoptionMember" xlink:label="loc_us-gaap_TypeOfAdoptionMember_823874_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_823872" xlink:to="loc_us-gaap_TypeOfAdoptionMember_823874_default" use="optional" order="47" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountingStandardsUpdate201613Member" xlink:label="loc_us-gaap_AccountingStandardsUpdate201613Member_823879" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfAdoptionMember_823874" xlink:to="loc_us-gaap_AccountingStandardsUpdate201613Member_823879" use="optional" order="48" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_MacroEconomicFactorsAxis" xlink:label="loc_cvbf_MacroEconomicFactorsAxis_823900" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_519" xlink:to="loc_cvbf_MacroEconomicFactorsAxis_823900" use="optional" order="49" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_MacroEconomicFactorsDomain" xlink:label="loc_cvbf_MacroEconomicFactorsDomain_823901" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_cvbf_MacroEconomicFactorsAxis_823900" xlink:to="loc_cvbf_MacroEconomicFactorsDomain_823901" use="optional" order="50" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_MacroEconomicFactorsDomain" xlink:label="loc_cvbf_MacroEconomicFactorsDomain_823901_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_cvbf_MacroEconomicFactorsAxis_823900" xlink:to="loc_cvbf_MacroEconomicFactorsDomain_823901_default" use="optional" order="51" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_GdpMember" xlink:label="loc_cvbf_GdpMember_823903" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cvbf_MacroEconomicFactorsDomain_823901" xlink:to="loc_cvbf_GdpMember_823903" use="optional" order="52" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_UnemploymentMember" xlink:label="loc_cvbf_UnemploymentMember_823904" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cvbf_MacroEconomicFactorsDomain_823901" xlink:to="loc_cvbf_UnemploymentMember_823904" use="optional" order="53" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_StatementScenarioAxis" xlink:label="loc_srt_StatementScenarioAxis_823905" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_519" xlink:to="loc_srt_StatementScenarioAxis_823905" use="optional" order="54" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ScenarioUnspecifiedDomain" xlink:label="loc_srt_ScenarioUnspecifiedDomain_823906" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementScenarioAxis_823905" xlink:to="loc_srt_ScenarioUnspecifiedDomain_823906" use="optional" order="55" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ScenarioUnspecifiedDomain" xlink:label="loc_srt_ScenarioUnspecifiedDomain_823906_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementScenarioAxis_823905" xlink:to="loc_srt_ScenarioUnspecifiedDomain_823906_default" use="optional" order="56" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ScenarioForecastMember" xlink:label="loc_srt_ScenarioForecastMember_823907" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ScenarioUnspecifiedDomain_823906" xlink:to="loc_srt_ScenarioForecastMember_823907" use="optional" order="57" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeAxis" xlink:label="loc_srt_RangeAxis_827803" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_519" xlink:to="loc_srt_RangeAxis_827803" use="optional" order="58" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_827804" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_827803" xlink:to="loc_srt_RangeMember_827804" use="optional" order="59" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_827804_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_827803" xlink:to="loc_srt_RangeMember_827804_default" use="optional" order="60" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NotesReceivableGross" xlink:label="loc_us-gaap_NotesReceivableGross_569496" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_505" xlink:to="loc_us-gaap_NotesReceivableGross_569496" use="optional" order="61" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease_823292" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_505" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease_823292" use="optional" order="62" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs_823293" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_505" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs_823293" use="optional" order="63" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProvisionForLoanLeaseAndOtherLosses" xlink:label="loc_us-gaap_ProvisionForLoanLeaseAndOtherLosses_823294" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_505" xlink:to="loc_us-gaap_ProvisionForLoanLeaseAndOtherLosses_823294" use="optional" order="64" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_AllocationOfReservesToTroubledDebtRestructuring" xlink:label="loc_cvbf_AllocationOfReservesToTroubledDebtRestructuring_823862" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_505" xlink:to="loc_cvbf_AllocationOfReservesToTroubledDebtRestructuring_823862" use="optional" order="65" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_IncreaseOrDecreaseInProvisionForUnfundedLoanCommitments" xlink:label="loc_cvbf_IncreaseOrDecreaseInProvisionForUnfundedLoanCommitments_823886" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_505" xlink:to="loc_cvbf_IncreaseOrDecreaseInProvisionForUnfundedLoanCommitments_823886" use="optional" order="66" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableAllowanceForCreditLosses" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLosses_823894" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_505" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLosses_823894" use="optional" order="67" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_AdjustmentOfTransitionAllowanceForCreditLosesForLoans" xlink:label="loc_cvbf_AdjustmentOfTransitionAllowanceForCreditLosesForLoans_823898" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_505" xlink:to="loc_cvbf_AdjustmentOfTransitionAllowanceForCreditLosesForLoans_823898" use="optional" order="68" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_PercentageOfIncreaseDecreaseInMacroEconomicFactors" xlink:label="loc_cvbf_PercentageOfIncreaseDecreaseInMacroEconomicFactors_827807" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_505" xlink:to="loc_cvbf_PercentageOfIncreaseDecreaseInMacroEconomicFactors_827807" use="optional" order="69" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.cvbfinancialcorp.com/role/LoansAndLeaseFinanceReceivablesAndAllowanceForCreditLossesSummaryOfComponentsOfLoansAndLeaseFinanceReceivablesIncludingPciLoansDetail">
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsNotesAndLoansReceivableLineItems" xlink:label="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_479" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LoansAndLeasesReceivableDeferredIncome" xlink:label="loc_us-gaap_LoansAndLeasesReceivableDeferredIncome_496" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_479" xlink:to="loc_us-gaap_LoansAndLeasesReceivableDeferredIncome_496" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_LoansReceivableConstruction" xlink:label="loc_cvbf_LoansReceivableConstruction_490" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_479" xlink:to="loc_cvbf_LoansReceivableConstruction_490" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LoansAndLeasesReceivableAllowance" xlink:label="loc_us-gaap_LoansAndLeasesReceivableAllowance_498" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_479" xlink:to="loc_us-gaap_LoansAndLeasesReceivableAllowance_498" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome" xlink:label="loc_us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome_497" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_479" xlink:to="loc_us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome_497" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LoansAndLeasesReceivableNetReportedAmount" xlink:label="loc_us-gaap_LoansAndLeasesReceivableNetReportedAmount_500" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_479" xlink:to="loc_us-gaap_LoansAndLeasesReceivableNetReportedAmount_500" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable" xlink:label="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_484" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_479" xlink:to="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_484" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis" xlink:label="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_480" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_484" xlink:to="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_480" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ReceivableTypeDomain" xlink:label="loc_us-gaap_ReceivableTypeDomain_483" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_480" xlink:to="loc_us-gaap_ReceivableTypeDomain_483" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ReceivableTypeDomain" xlink:label="loc_us-gaap_ReceivableTypeDomain_483_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_480" xlink:to="loc_us-gaap_ReceivableTypeDomain_483_default" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CreditLossStatusAxis" xlink:label="loc_us-gaap_CreditLossStatusAxis_481" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_484" xlink:to="loc_us-gaap_CreditLossStatusAxis_481" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CreditLossStatusDomain" xlink:label="loc_us-gaap_CreditLossStatusDomain_482" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditLossStatusAxis_481" xlink:to="loc_us-gaap_CreditLossStatusDomain_482" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CreditLossStatusDomain" xlink:label="loc_us-gaap_CreditLossStatusDomain_482_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditLossStatusAxis_481" xlink:to="loc_us-gaap_CreditLossStatusDomain_482_default" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InternalCreditAssessmentAxis" xlink:label="loc_us-gaap_InternalCreditAssessmentAxis_474448" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_484" xlink:to="loc_us-gaap_InternalCreditAssessmentAxis_474448" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InternalCreditAssessmentDomain" xlink:label="loc_us-gaap_InternalCreditAssessmentDomain_474449" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InternalCreditAssessmentAxis_474448" xlink:to="loc_us-gaap_InternalCreditAssessmentDomain_474449" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InternalCreditAssessmentDomain" xlink:label="loc_us-gaap_InternalCreditAssessmentDomain_474449_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InternalCreditAssessmentAxis_474448" xlink:to="loc_us-gaap_InternalCreditAssessmentDomain_474449_default" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_490152" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_484" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_490152" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_490153" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_490152" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_490153" use="optional" order="17" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_490153_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_490152" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_490153_default" use="optional" order="18" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RealEstateLoanMember" xlink:label="loc_us-gaap_RealEstateLoanMember_490176" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_490153" xlink:to="loc_us-gaap_RealEstateLoanMember_490176" use="optional" order="19" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_DairyAndLivestockAndAgribusinessMember" xlink:label="loc_cvbf_DairyAndLivestockAndAgribusinessMember_490180" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_490153" xlink:to="loc_cvbf_DairyAndLivestockAndAgribusinessMember_490180" use="optional" order="20" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_ConsumerOtherMember" xlink:label="loc_cvbf_ConsumerOtherMember_490197" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_490153" xlink:to="loc_cvbf_ConsumerOtherMember_490197" use="optional" order="21" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_ConsumerMortgageMember" xlink:label="loc_cvbf_ConsumerMortgageMember_490200" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_490153" xlink:to="loc_cvbf_ConsumerMortgageMember_490200" use="optional" order="22" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_CommercialAndIndustrialMember" xlink:label="loc_cvbf_CommercialAndIndustrialMember_490201" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_490153" xlink:to="loc_cvbf_CommercialAndIndustrialMember_490201" use="optional" order="23" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_CommercialTradeFinancingMember" xlink:label="loc_cvbf_CommercialTradeFinancingMember_490203" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_490153" xlink:to="loc_cvbf_CommercialTradeFinancingMember_490203" use="optional" order="24" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_MunicipalLeaseFinanceReceivablesMember" xlink:label="loc_cvbf_MunicipalLeaseFinanceReceivablesMember_490195" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_490153" xlink:to="loc_cvbf_MunicipalLeaseFinanceReceivablesMember_490195" use="optional" order="25" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_PayCheckProtectionProgramMember" xlink:label="loc_cvbf_PayCheckProtectionProgramMember_823303" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_490153" xlink:to="loc_cvbf_PayCheckProtectionProgramMember_823303" use="optional" order="26" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LoansAndLeasesReceivableGrossCarryingAmount" xlink:label="loc_us-gaap_LoansAndLeasesReceivableGrossCarryingAmount_317883" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_479" xlink:to="loc_us-gaap_LoansAndLeasesReceivableGrossCarryingAmount_317883" use="optional" order="27" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NotesReceivableGross" xlink:label="loc_us-gaap_NotesReceivableGross_489" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_479" xlink:to="loc_us-gaap_NotesReceivableGross_489" use="optional" order="28" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.cvbfinancialcorp.com/role/LoansAndLeaseFinanceReceivablesAndAllowanceForCreditLossesSummaryOfLoansByTypeAndOriginationYearAccordingToOurInternalRiskRatingsDetail">
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentLineItems" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_823360" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable" xlink:label="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_823313" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_823360" xlink:to="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_823313" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InternalCreditAssessmentAxis" xlink:label="loc_us-gaap_InternalCreditAssessmentAxis_823323" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_823313" xlink:to="loc_us-gaap_InternalCreditAssessmentAxis_823323" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InternalCreditAssessmentDomain" xlink:label="loc_us-gaap_InternalCreditAssessmentDomain_823324" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InternalCreditAssessmentAxis_823323" xlink:to="loc_us-gaap_InternalCreditAssessmentDomain_823324" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InternalCreditAssessmentDomain" xlink:label="loc_us-gaap_InternalCreditAssessmentDomain_823324_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InternalCreditAssessmentAxis_823323" xlink:to="loc_us-gaap_InternalCreditAssessmentDomain_823324_default" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PassMember" xlink:label="loc_us-gaap_PassMember_823325" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InternalCreditAssessmentDomain_823324" xlink:to="loc_us-gaap_PassMember_823325" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SpecialMentionMember" xlink:label="loc_us-gaap_SpecialMentionMember_823326" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InternalCreditAssessmentDomain_823324" xlink:to="loc_us-gaap_SpecialMentionMember_823326" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SubstandardMember" xlink:label="loc_us-gaap_SubstandardMember_823327" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InternalCreditAssessmentDomain_823324" xlink:to="loc_us-gaap_SubstandardMember_823327" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DoubtfulMember" xlink:label="loc_us-gaap_DoubtfulMember_823328" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InternalCreditAssessmentDomain_823324" xlink:to="loc_us-gaap_DoubtfulMember_823328" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_823330" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_823313" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_823330" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_823331" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_823330" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_823331" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_823331_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_823330" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_823331_default" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_CommercialRealEstateLoansMember" xlink:label="loc_cvbf_CommercialRealEstateLoansMember_823335" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_823331" xlink:to="loc_cvbf_CommercialRealEstateLoansMember_823335" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ConstructionLoansMember" xlink:label="loc_us-gaap_ConstructionLoansMember_823336" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_823331" xlink:to="loc_us-gaap_ConstructionLoansMember_823336" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_CommercialTradeFinancingMember" xlink:label="loc_cvbf_CommercialTradeFinancingMember_823348" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_823331" xlink:to="loc_cvbf_CommercialTradeFinancingMember_823348" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_PayCheckProtectionProgramMember" xlink:label="loc_cvbf_PayCheckProtectionProgramMember_823349" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_823331" xlink:to="loc_cvbf_PayCheckProtectionProgramMember_823349" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_CommercialAndIndustrialLoansMember" xlink:label="loc_cvbf_CommercialAndIndustrialLoansMember_823350" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_823331" xlink:to="loc_cvbf_CommercialAndIndustrialLoansMember_823350" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_DairyLivestockAndAgribusinessMember" xlink:label="loc_cvbf_DairyLivestockAndAgribusinessMember_823352" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_823331" xlink:to="loc_cvbf_DairyLivestockAndAgribusinessMember_823352" use="optional" order="17" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_MunicipalLeaseFinanceReceivablesMember" xlink:label="loc_cvbf_MunicipalLeaseFinanceReceivablesMember_823354" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_823331" xlink:to="loc_cvbf_MunicipalLeaseFinanceReceivablesMember_823354" use="optional" order="18" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_ConsumerMortgageMember" xlink:label="loc_cvbf_ConsumerMortgageMember_823356" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_823331" xlink:to="loc_cvbf_ConsumerMortgageMember_823356" use="optional" order="19" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_ConsumerOtherMember" xlink:label="loc_cvbf_ConsumerOtherMember_823446" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_823331" xlink:to="loc_cvbf_ConsumerOtherMember_823446" use="optional" order="20" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableOriginatedInCurrentFiscalYear" xlink:label="loc_us-gaap_FinancingReceivableOriginatedInCurrentFiscalYear_823361" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_823360" xlink:to="loc_us-gaap_FinancingReceivableOriginatedInCurrentFiscalYear_823361" use="optional" order="21" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear" xlink:label="loc_us-gaap_FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear_823362" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_823360" xlink:to="loc_us-gaap_FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear_823362" use="optional" order="22" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear" xlink:label="loc_us-gaap_FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear_823363" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_823360" xlink:to="loc_us-gaap_FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear_823363" use="optional" order="23" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear" xlink:label="loc_us-gaap_FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear_823364" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_823360" xlink:to="loc_us-gaap_FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear_823364" use="optional" order="24" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear" xlink:label="loc_us-gaap_FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear_823366" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_823360" xlink:to="loc_us-gaap_FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear_823366" use="optional" order="25" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear" xlink:label="loc_us-gaap_FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear_823367" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_823360" xlink:to="loc_us-gaap_FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear_823367" use="optional" order="26" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRevolving" xlink:label="loc_us-gaap_FinancingReceivableRevolving_823370" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_823360" xlink:to="loc_us-gaap_FinancingReceivableRevolving_823370" use="optional" order="27" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_FinancingReceivableRevolvingLoansConvertedToTermLoans" xlink:label="loc_cvbf_FinancingReceivableRevolvingLoansConvertedToTermLoans_823371" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_823360" xlink:to="loc_cvbf_FinancingReceivableRevolvingLoansConvertedToTermLoans_823371" use="optional" order="28" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LoansAndLeasesReceivableGrossCarryingAmount" xlink:label="loc_us-gaap_LoansAndLeasesReceivableGrossCarryingAmount_823373" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_823360" xlink:to="loc_us-gaap_LoansAndLeasesReceivableGrossCarryingAmount_823373" use="optional" order="29" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.cvbfinancialcorp.com/role/LoansAndLeaseFinanceReceivablesAndAllowanceForCreditLossesSummaryOfLoanIncludingPciLoansByInternalRiskRatingsDetail">
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsNotesAndLoansReceivableLineItems" xlink:label="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_563" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NotesReceivableGross" xlink:label="loc_us-gaap_NotesReceivableGross_576" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_563" xlink:to="loc_us-gaap_NotesReceivableGross_576" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_LoansReceivableCommercialRealEstateNonOwnerOccupied" xlink:label="loc_cvbf_LoansReceivableCommercialRealEstateNonOwnerOccupied_572" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_563" xlink:to="loc_cvbf_LoansReceivableCommercialRealEstateNonOwnerOccupied_572" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LoansAndLeasesReceivableGrossCarryingAmount" xlink:label="loc_us-gaap_LoansAndLeasesReceivableGrossCarryingAmount_579" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_563" xlink:to="loc_us-gaap_LoansAndLeasesReceivableGrossCarryingAmount_579" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable" xlink:label="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_568" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_563" xlink:to="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_568" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis" xlink:label="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_564" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_568" xlink:to="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_564" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ReceivableTypeDomain" xlink:label="loc_us-gaap_ReceivableTypeDomain_567" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_564" xlink:to="loc_us-gaap_ReceivableTypeDomain_567" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ReceivableTypeDomain" xlink:label="loc_us-gaap_ReceivableTypeDomain_567_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_564" xlink:to="loc_us-gaap_ReceivableTypeDomain_567_default" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InternalCreditAssessmentAxis" xlink:label="loc_us-gaap_InternalCreditAssessmentAxis_565" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_568" xlink:to="loc_us-gaap_InternalCreditAssessmentAxis_565" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InternalCreditAssessmentDomain" xlink:label="loc_us-gaap_InternalCreditAssessmentDomain_566" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InternalCreditAssessmentAxis_565" xlink:to="loc_us-gaap_InternalCreditAssessmentDomain_566" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InternalCreditAssessmentDomain" xlink:label="loc_us-gaap_InternalCreditAssessmentDomain_566_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InternalCreditAssessmentAxis_565" xlink:to="loc_us-gaap_InternalCreditAssessmentDomain_566_default" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DoubtfulMember" xlink:label="loc_us-gaap_DoubtfulMember_583" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InternalCreditAssessmentDomain_566" xlink:to="loc_us-gaap_DoubtfulMember_583" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PassMember" xlink:label="loc_us-gaap_PassMember_580" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InternalCreditAssessmentDomain_566" xlink:to="loc_us-gaap_PassMember_580" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SpecialMentionMember" xlink:label="loc_us-gaap_SpecialMentionMember_581" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InternalCreditAssessmentDomain_566" xlink:to="loc_us-gaap_SpecialMentionMember_581" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SubstandardMember" xlink:label="loc_us-gaap_SubstandardMember_582" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InternalCreditAssessmentDomain_566" xlink:to="loc_us-gaap_SubstandardMember_582" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CreditLossStatusAxis" xlink:label="loc_us-gaap_CreditLossStatusAxis_457601" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_568" xlink:to="loc_us-gaap_CreditLossStatusAxis_457601" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CreditLossStatusDomain" xlink:label="loc_us-gaap_CreditLossStatusDomain_457602" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditLossStatusAxis_457601" xlink:to="loc_us-gaap_CreditLossStatusDomain_457602" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CreditLossStatusDomain" xlink:label="loc_us-gaap_CreditLossStatusDomain_457602_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditLossStatusAxis_457601" xlink:to="loc_us-gaap_CreditLossStatusDomain_457602_default" use="optional" order="17" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_490188" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_568" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_490188" use="optional" order="18" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_490189" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_490188" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_490189" use="optional" order="19" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_490189_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_490188" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_490189_default" use="optional" order="20" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_CommercialConstructionMember" xlink:label="loc_cvbf_CommercialConstructionMember_490211" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_490189" xlink:to="loc_cvbf_CommercialConstructionMember_490211" use="optional" order="21" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_MunicipalLeaseFinanceReceivablesMember" xlink:label="loc_cvbf_MunicipalLeaseFinanceReceivablesMember_490196" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_490189" xlink:to="loc_cvbf_MunicipalLeaseFinanceReceivablesMember_490196" use="optional" order="22" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_DairyAndLivestockAndAgribusinessMember" xlink:label="loc_cvbf_DairyAndLivestockAndAgribusinessMember_490190" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_490189" xlink:to="loc_cvbf_DairyAndLivestockAndAgribusinessMember_490190" use="optional" order="23" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_ConsumerOtherMember" xlink:label="loc_cvbf_ConsumerOtherMember_490198" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_490189" xlink:to="loc_cvbf_ConsumerOtherMember_490198" use="optional" order="24" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_ConsumerMortgageMember" xlink:label="loc_cvbf_ConsumerMortgageMember_490199" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_490189" xlink:to="loc_cvbf_ConsumerMortgageMember_490199" use="optional" order="25" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_CommercialAndIndustrialMember" xlink:label="loc_cvbf_CommercialAndIndustrialMember_490202" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_490189" xlink:to="loc_cvbf_CommercialAndIndustrialMember_490202" use="optional" order="26" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_CommercialTradeFinancingMember" xlink:label="loc_cvbf_CommercialTradeFinancingMember_490204" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_490189" xlink:to="loc_cvbf_CommercialTradeFinancingMember_490204" use="optional" order="27" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_CommercialRealEstateOwnerOccupiedMember" xlink:label="loc_cvbf_CommercialRealEstateOwnerOccupiedMember_490209" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_490189" xlink:to="loc_cvbf_CommercialRealEstateOwnerOccupiedMember_490209" use="optional" order="28" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_CommercialDevelopmentMember" xlink:label="loc_cvbf_CommercialDevelopmentMember_490210" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_490189" xlink:to="loc_cvbf_CommercialDevelopmentMember_490210" use="optional" order="29" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.cvbfinancialcorp.com/role/LoansAndLeaseFinanceReceivablesAndAllowanceForCreditLossesScheduleOfBalanceAndActivityRelatedToAllowanceForLoanLossesForHeldForInvestmentLoansByTypeDetail">
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_589" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs" xlink:label="loc_us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs_595" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_589" xlink:to="loc_us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs_595" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts" xlink:label="loc_us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts_596" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_589" xlink:to="loc_us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts_596" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProvisionForLoanAndLeaseLosses" xlink:label="loc_us-gaap_ProvisionForLoanAndLeaseLosses_597" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_589" xlink:to="loc_us-gaap_ProvisionForLoanAndLeaseLosses_597" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LoansAndLeasesReceivableAllowance" xlink:label="loc_us-gaap_LoansAndLeasesReceivableAllowance_594" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_589" xlink:to="loc_us-gaap_LoansAndLeasesReceivableAllowance_594" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable" xlink:label="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_592" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_589" xlink:to="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_592" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CreditLossStatusAxis" xlink:label="loc_us-gaap_CreditLossStatusAxis_587" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_592" xlink:to="loc_us-gaap_CreditLossStatusAxis_587" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CreditLossStatusDomain" xlink:label="loc_us-gaap_CreditLossStatusDomain_588" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditLossStatusAxis_587" xlink:to="loc_us-gaap_CreditLossStatusDomain_588" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CreditLossStatusDomain" xlink:label="loc_us-gaap_CreditLossStatusDomain_588_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditLossStatusAxis_587" xlink:to="loc_us-gaap_CreditLossStatusDomain_588_default" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancialAssetAcquiredWithCreditDeteriorationMember" xlink:label="loc_us-gaap_FinancialAssetAcquiredWithCreditDeteriorationMember_593" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditLossStatusDomain_588" xlink:to="loc_us-gaap_FinancialAssetAcquiredWithCreditDeteriorationMember_593" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_590" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_592" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_590" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_591" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_590" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_591" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_591_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_590" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_591_default" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_CommercialAndIndustrialLoansMember" xlink:label="loc_cvbf_CommercialAndIndustrialLoansMember_599" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_591" xlink:to="loc_cvbf_CommercialAndIndustrialLoansMember_599" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommercialRealEstateMember" xlink:label="loc_us-gaap_CommercialRealEstateMember_601" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_591" xlink:to="loc_us-gaap_CommercialRealEstateMember_601" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ConstructionLoansMember" xlink:label="loc_us-gaap_ConstructionLoansMember_602" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_591" xlink:to="loc_us-gaap_ConstructionLoansMember_602" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_ConsumerAndOtherLoansMember" xlink:label="loc_cvbf_ConsumerAndOtherLoansMember_606" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_591" xlink:to="loc_cvbf_ConsumerAndOtherLoansMember_606" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ResidentialRealEstateMember" xlink:label="loc_us-gaap_ResidentialRealEstateMember_603" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_591" xlink:to="loc_us-gaap_ResidentialRealEstateMember_603" use="optional" order="17" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_DairyLivestockAndAgribusinessMember" xlink:label="loc_cvbf_DairyLivestockAndAgribusinessMember_604" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_591" xlink:to="loc_cvbf_DairyLivestockAndAgribusinessMember_604" use="optional" order="18" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_MunicipalLeaseFinanceReceivablesMember" xlink:label="loc_cvbf_MunicipalLeaseFinanceReceivablesMember_605" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_591" xlink:to="loc_cvbf_MunicipalLeaseFinanceReceivablesMember_605" use="optional" order="19" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_SmallBusinessAdministrationLoansMember" xlink:label="loc_cvbf_SmallBusinessAdministrationLoansMember_600" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_591" xlink:to="loc_cvbf_SmallBusinessAdministrationLoansMember_600" use="optional" order="20" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_PayCheckProtectionProgramMember" xlink:label="loc_cvbf_PayCheckProtectionProgramMember_823522" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_591" xlink:to="loc_cvbf_PayCheckProtectionProgramMember_823522" use="optional" order="21" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AdjustmentsForNewAccountingPronouncementsAxis" xlink:label="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_823490" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_592" xlink:to="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_823490" use="optional" order="22" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TypeOfAdoptionMember" xlink:label="loc_us-gaap_TypeOfAdoptionMember_823491" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_823490" xlink:to="loc_us-gaap_TypeOfAdoptionMember_823491" use="optional" order="23" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TypeOfAdoptionMember" xlink:label="loc_us-gaap_TypeOfAdoptionMember_823491_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_823490" xlink:to="loc_us-gaap_TypeOfAdoptionMember_823491_default" use="optional" order="24" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountingStandardsUpdate201613Member" xlink:label="loc_us-gaap_AccountingStandardsUpdate201613Member_823498" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfAdoptionMember_823491" xlink:to="loc_us-gaap_AccountingStandardsUpdate201613Member_823498" use="optional" order="25" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RestatementAxis" xlink:label="loc_srt_RestatementAxis_823502" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_592" xlink:to="loc_srt_RestatementAxis_823502" use="optional" order="26" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RestatementDomain" xlink:label="loc_srt_RestatementDomain_823503" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RestatementAxis_823502" xlink:to="loc_srt_RestatementDomain_823503" use="optional" order="27" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RestatementDomain" xlink:label="loc_srt_RestatementDomain_823503_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RestatementAxis_823502" xlink:to="loc_srt_RestatementDomain_823503_default" use="optional" order="28" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ScenarioPreviouslyReportedMember" xlink:label="loc_srt_ScenarioPreviouslyReportedMember_823504" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RestatementDomain_823503" xlink:to="loc_srt_ScenarioPreviouslyReportedMember_823504" use="optional" order="29" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_LoansAndLeasesReceivableAllowanceIncludePciLoans" xlink:label="loc_cvbf_LoansAndLeasesReceivableAllowanceIncludePciLoans_847091" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_589" xlink:to="loc_cvbf_LoansAndLeasesReceivableAllowanceIncludePciLoans_847091" use="optional" order="30" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.cvbfinancialcorp.com/role/LoansAndLeaseFinanceReceivablesAndAllowanceForCreditLossesScheduleOfRecordedInvestmentInLoansHeldForInvestmentAndRelatedAllowanceForLoanLossesByLoanTypeDetail">
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_611" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1_619" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_611" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1_619" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment" xlink:label="loc_us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment_617" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_611" xlink:to="loc_us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment_617" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment_620" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_611" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment_620" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment" xlink:label="loc_us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment_616" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_611" xlink:to="loc_us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment_616" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable" xlink:label="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_614" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_611" xlink:to="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_614" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CreditLossStatusAxis" xlink:label="loc_us-gaap_CreditLossStatusAxis_609" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_614" xlink:to="loc_us-gaap_CreditLossStatusAxis_609" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CreditLossStatusDomain" xlink:label="loc_us-gaap_CreditLossStatusDomain_610" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditLossStatusAxis_609" xlink:to="loc_us-gaap_CreditLossStatusDomain_610" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CreditLossStatusDomain" xlink:label="loc_us-gaap_CreditLossStatusDomain_610_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditLossStatusAxis_609" xlink:to="loc_us-gaap_CreditLossStatusDomain_610_default" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_612" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_614" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_612" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_613" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_612" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_613" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_613_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_612" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_613_default" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_CommercialAndIndustrialLoansMember" xlink:label="loc_cvbf_CommercialAndIndustrialLoansMember_622" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_613" xlink:to="loc_cvbf_CommercialAndIndustrialLoansMember_622" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommercialRealEstateMember" xlink:label="loc_us-gaap_CommercialRealEstateMember_624" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_613" xlink:to="loc_us-gaap_CommercialRealEstateMember_624" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_ConsumerAndOtherLoansMember" xlink:label="loc_cvbf_ConsumerAndOtherLoansMember_629" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_613" xlink:to="loc_cvbf_ConsumerAndOtherLoansMember_629" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_DairyLivestockAndAgribusinessMember" xlink:label="loc_cvbf_DairyLivestockAndAgribusinessMember_627" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_613" xlink:to="loc_cvbf_DairyLivestockAndAgribusinessMember_627" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_RealEstateConstructionMember" xlink:label="loc_cvbf_RealEstateConstructionMember_625" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_613" xlink:to="loc_cvbf_RealEstateConstructionMember_625" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ResidentialRealEstateMember" xlink:label="loc_us-gaap_ResidentialRealEstateMember_626" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_613" xlink:to="loc_us-gaap_ResidentialRealEstateMember_626" use="optional" order="17" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_MunicipalLeaseFinanceReceivablesMember" xlink:label="loc_cvbf_MunicipalLeaseFinanceReceivablesMember_628" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_613" xlink:to="loc_cvbf_MunicipalLeaseFinanceReceivablesMember_628" use="optional" order="18" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_SmallBusinessAdministrationLoansMember" xlink:label="loc_cvbf_SmallBusinessAdministrationLoansMember_623" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_613" xlink:to="loc_cvbf_SmallBusinessAdministrationLoansMember_623" use="optional" order="19" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.cvbfinancialcorp.com/role/LoansAndLeaseFinanceReceivablesAndAllowanceForCreditLossesScheduleOfRecordedInvestmentInAndAgingOfPastDueAndNonaccrualLoansIncludingPciLoansByClassOfLoansDetail">
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsNotesAndLoansReceivableLineItems" xlink:label="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_632" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentCurrent" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentCurrent_642" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_632" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentCurrent_642" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus_641" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_632" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus_641" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentPastDue" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentPastDue_640" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_632" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentPastDue_640" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LoansAndLeasesReceivableGrossCarryingAmount" xlink:label="loc_us-gaap_LoansAndLeasesReceivableGrossCarryingAmount_643" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_632" xlink:to="loc_us-gaap_LoansAndLeasesReceivableGrossCarryingAmount_643" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable" xlink:label="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_639" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_632" xlink:to="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_639" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis" xlink:label="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_633" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_639" xlink:to="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_633" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ReceivableTypeDomain" xlink:label="loc_us-gaap_ReceivableTypeDomain_638" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_633" xlink:to="loc_us-gaap_ReceivableTypeDomain_638" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ReceivableTypeDomain" xlink:label="loc_us-gaap_ReceivableTypeDomain_638_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_633" xlink:to="loc_us-gaap_ReceivableTypeDomain_638_default" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_634" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_639" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_634" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_635" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_634" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_635" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_635_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_634" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_635_default" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_CommercialAndIndustrialLoansMember" xlink:label="loc_cvbf_CommercialAndIndustrialLoansMember_644" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_635" xlink:to="loc_cvbf_CommercialAndIndustrialLoansMember_644" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_CommercialRealEstateNonOwnerOccupiedMember" xlink:label="loc_cvbf_CommercialRealEstateNonOwnerOccupiedMember_647" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_635" xlink:to="loc_cvbf_CommercialRealEstateNonOwnerOccupiedMember_647" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_CommercialRealEstateOwnerOccupiedMember" xlink:label="loc_cvbf_CommercialRealEstateOwnerOccupiedMember_646" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_635" xlink:to="loc_cvbf_CommercialRealEstateOwnerOccupiedMember_646" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_ConstructionNonSpeculativeMember" xlink:label="loc_cvbf_ConstructionNonSpeculativeMember_649" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_635" xlink:to="loc_cvbf_ConstructionNonSpeculativeMember_649" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_ConstructionSpeculativeMember" xlink:label="loc_cvbf_ConstructionSpeculativeMember_648" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_635" xlink:to="loc_cvbf_ConstructionSpeculativeMember_648" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_ConsumerAndOtherLoansMember" xlink:label="loc_cvbf_ConsumerAndOtherLoansMember_653" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_635" xlink:to="loc_cvbf_ConsumerAndOtherLoansMember_653" use="optional" order="17" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_DairyLivestockAndAgribusinessMember" xlink:label="loc_cvbf_DairyLivestockAndAgribusinessMember_651" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_635" xlink:to="loc_cvbf_DairyLivestockAndAgribusinessMember_651" use="optional" order="18" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ResidentialRealEstateMember" xlink:label="loc_us-gaap_ResidentialRealEstateMember_650" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_635" xlink:to="loc_us-gaap_ResidentialRealEstateMember_650" use="optional" order="19" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_MunicipalLeaseFinanceReceivablesMember" xlink:label="loc_cvbf_MunicipalLeaseFinanceReceivablesMember_652" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_635" xlink:to="loc_cvbf_MunicipalLeaseFinanceReceivablesMember_652" use="optional" order="20" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_SmallBusinessAdministrationLoansMember" xlink:label="loc_cvbf_SmallBusinessAdministrationLoansMember_645" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_635" xlink:to="loc_cvbf_SmallBusinessAdministrationLoansMember_645" use="optional" order="21" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_PayCheckProtectionProgramMember" xlink:label="loc_cvbf_PayCheckProtectionProgramMember_823537" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_635" xlink:to="loc_cvbf_PayCheckProtectionProgramMember_823537" use="optional" order="22" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivablesPeriodPastDueAxis" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_636" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_639" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_636" use="optional" order="23" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivablesPeriodPastDueDomain" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_637" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_636" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_637" use="optional" order="24" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivablesPeriodPastDueDomain" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_637_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_636" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_637_default" use="optional" order="25" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivables30To59DaysPastDueMember" xlink:label="loc_us-gaap_FinancingReceivables30To59DaysPastDueMember_654" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_637" xlink:to="loc_us-gaap_FinancingReceivables30To59DaysPastDueMember_654" use="optional" order="26" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivables60To89DaysPastDueMember" xlink:label="loc_us-gaap_FinancingReceivables60To89DaysPastDueMember_655" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_637" xlink:to="loc_us-gaap_FinancingReceivables60To89DaysPastDueMember_655" use="optional" order="27" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember" xlink:label="loc_us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember_826880" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_637" xlink:to="loc_us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember_826880" use="optional" order="28" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_FinancingReceivableRecordedInvestmentNonAccrualWithNoAllowanceForCreditLosses" xlink:label="loc_cvbf_FinancingReceivableRecordedInvestmentNonAccrualWithNoAllowanceForCreditLosses_823558" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_632" xlink:to="loc_cvbf_FinancingReceivableRecordedInvestmentNonAccrualWithNoAllowanceForCreditLosses_823558" use="optional" order="29" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing_823565" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_632" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing_823565" use="optional" order="30" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_FinancingReceivableRecordedInvestmentCurrentNotPastDueButAccruing" xlink:label="loc_cvbf_FinancingReceivableRecordedInvestmentCurrentNotPastDueButAccruing_827091" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_632" xlink:to="loc_cvbf_FinancingReceivableRecordedInvestmentCurrentNotPastDueButAccruing_827091" use="optional" order="31" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_FinancingReceivableRecordedInvestmentPastDueAndAccruing" xlink:label="loc_cvbf_FinancingReceivableRecordedInvestmentPastDueAndAccruing_827121" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_632" xlink:to="loc_cvbf_FinancingReceivableRecordedInvestmentPastDueAndAccruing_827121" use="optional" order="32" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.cvbfinancialcorp.com/role/LoansAndLeaseFinanceReceivablesAndAllowanceForCreditLossesScheduleOfRecordedInvestmentInAndAgingOfPastDueAndNonaccrualLoansIncludingPciLoansByClassOfLoansParentheticalDetail">
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsNotesAndLoansReceivableLineItems" xlink:label="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_659" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable" xlink:label="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_662" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_659" xlink:to="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_662" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivablesPeriodPastDueAxis" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_660" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_662" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_660" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivablesPeriodPastDueDomain" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_661" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_660" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_661" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivablesPeriodPastDueDomain" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_661_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_660" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_661_default" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivables30To59DaysPastDueMember" xlink:label="loc_us-gaap_FinancingReceivables30To59DaysPastDueMember_665" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_661" xlink:to="loc_us-gaap_FinancingReceivables30To59DaysPastDueMember_665" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivables60To89DaysPastDueMember" xlink:label="loc_us-gaap_FinancingReceivables60To89DaysPastDueMember_666" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_661" xlink:to="loc_us-gaap_FinancingReceivables60To89DaysPastDueMember_666" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember" xlink:label="loc_us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember_667" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_661" xlink:to="loc_us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember_667" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_327902" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_662" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_327902" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_327903" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_327902" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_327903" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_327903_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_327902" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_327903_default" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_513708" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_662" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_513708" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_513709" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_513708" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_513709" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_513709_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_513708" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_513709_default" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_SmallBusinessAdministrationLoansMember" xlink:label="loc_cvbf_SmallBusinessAdministrationLoansMember_513710" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_513709" xlink:to="loc_cvbf_SmallBusinessAdministrationLoansMember_513710" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GuaranteeObligationsByNatureAxis" xlink:label="loc_us-gaap_GuaranteeObligationsByNatureAxis_513711" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_662" xlink:to="loc_us-gaap_GuaranteeObligationsByNatureAxis_513711" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GuaranteeObligationsNatureDomain" xlink:label="loc_us-gaap_GuaranteeObligationsNatureDomain_513712" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_GuaranteeObligationsByNatureAxis_513711" xlink:to="loc_us-gaap_GuaranteeObligationsNatureDomain_513712" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GuaranteeObligationsNatureDomain" xlink:label="loc_us-gaap_GuaranteeObligationsNatureDomain_513712_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_GuaranteeObligationsByNatureAxis_513711" xlink:to="loc_us-gaap_GuaranteeObligationsNatureDomain_513712_default" use="optional" order="17" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancialGuaranteeMember" xlink:label="loc_us-gaap_FinancialGuaranteeMember_513713" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GuaranteeObligationsNatureDomain_513712" xlink:to="loc_us-gaap_FinancialGuaranteeMember_513713" use="optional" order="18" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_FinancingReceivableRecordedInvestmentCurrentNonaccrual" xlink:label="loc_cvbf_FinancingReceivableRecordedInvestmentCurrentNonaccrual_663" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_659" xlink:to="loc_cvbf_FinancingReceivableRecordedInvestmentCurrentNonaccrual_663" use="optional" order="19" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus_664" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_659" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus_664" use="optional" order="20" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_FinancingReceivableRecordedInvestmentNonaccrual" xlink:label="loc_cvbf_FinancingReceivableRecordedInvestmentNonaccrual_328072" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_659" xlink:to="loc_cvbf_FinancingReceivableRecordedInvestmentNonaccrual_328072" use="optional" order="21" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.cvbfinancialcorp.com/role/LoansAndLeaseFinanceReceivablesAndAllowanceForCreditLossesScheduleOfHeldForInvestmentLoansIndividuallyEvaluatedForImpairmentByClassOfLoansDetail">
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_670" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod" xlink:label="loc_us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod_686" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_670" xlink:to="loc_us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod_686" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_ImpairedFinancingReceivableWithNoRelatedAllowance" xlink:label="loc_cvbf_ImpairedFinancingReceivableWithNoRelatedAllowance_680" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_670" xlink:to="loc_cvbf_ImpairedFinancingReceivableWithNoRelatedAllowance_680" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment" xlink:label="loc_us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment_683" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_670" xlink:to="loc_us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment_683" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment" xlink:label="loc_us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment_674" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_670" xlink:to="loc_us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment_674" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance" xlink:label="loc_us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance_677" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_670" xlink:to="loc_us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance_677" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment" xlink:label="loc_us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment_684" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_670" xlink:to="loc_us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment_684" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod" xlink:label="loc_us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod_687" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_670" xlink:to="loc_us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod_687" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment" xlink:label="loc_us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment_675" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_670" xlink:to="loc_us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment_675" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance" xlink:label="loc_us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance_678" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_670" xlink:to="loc_us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance_678" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment" xlink:label="loc_us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment_685" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_670" xlink:to="loc_us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment_685" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod" xlink:label="loc_us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod_688" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_670" xlink:to="loc_us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod_688" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ImpairedFinancingReceivableRecordedInvestment" xlink:label="loc_us-gaap_ImpairedFinancingReceivableRecordedInvestment_676" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_670" xlink:to="loc_us-gaap_ImpairedFinancingReceivableRecordedInvestment_676" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ImpairedFinancingReceivableRelatedAllowance" xlink:label="loc_us-gaap_ImpairedFinancingReceivableRelatedAllowance_682" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_670" xlink:to="loc_us-gaap_ImpairedFinancingReceivableRelatedAllowance_682" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_ImpairedFinancingReceivableRelatedAllowanceWithRelatedAllowance" xlink:label="loc_cvbf_ImpairedFinancingReceivableRelatedAllowanceWithRelatedAllowance_681" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_670" xlink:to="loc_cvbf_ImpairedFinancingReceivableRelatedAllowanceWithRelatedAllowance_681" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance" xlink:label="loc_us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance_679" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_670" xlink:to="loc_us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance_679" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable" xlink:label="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_673" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_670" xlink:to="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_673" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_671" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_673" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_671" use="optional" order="17" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_672" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_671" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_672" use="optional" order="18" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_672_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_671" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_672_default" use="optional" order="19" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_CommercialAndIndustrialLoansMember" xlink:label="loc_cvbf_CommercialAndIndustrialLoansMember_689" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_672" xlink:to="loc_cvbf_CommercialAndIndustrialLoansMember_689" use="optional" order="20" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_CommercialRealEstateNonOwnerOccupiedMember" xlink:label="loc_cvbf_CommercialRealEstateNonOwnerOccupiedMember_692" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_672" xlink:to="loc_cvbf_CommercialRealEstateNonOwnerOccupiedMember_692" use="optional" order="21" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_CommercialRealEstateOwnerOccupiedMember" xlink:label="loc_cvbf_CommercialRealEstateOwnerOccupiedMember_691" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_672" xlink:to="loc_cvbf_CommercialRealEstateOwnerOccupiedMember_691" use="optional" order="22" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_ConstructionNonSpeculativeMember" xlink:label="loc_cvbf_ConstructionNonSpeculativeMember_694" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_672" xlink:to="loc_cvbf_ConstructionNonSpeculativeMember_694" use="optional" order="23" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_ConstructionSpeculativeMember" xlink:label="loc_cvbf_ConstructionSpeculativeMember_693" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_672" xlink:to="loc_cvbf_ConstructionSpeculativeMember_693" use="optional" order="24" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_ConsumerAndOtherLoansMember" xlink:label="loc_cvbf_ConsumerAndOtherLoansMember_698" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_672" xlink:to="loc_cvbf_ConsumerAndOtherLoansMember_698" use="optional" order="25" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_DairyLivestockAndAgribusinessMember" xlink:label="loc_cvbf_DairyLivestockAndAgribusinessMember_696" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_672" xlink:to="loc_cvbf_DairyLivestockAndAgribusinessMember_696" use="optional" order="26" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ResidentialRealEstateMember" xlink:label="loc_us-gaap_ResidentialRealEstateMember_695" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_672" xlink:to="loc_us-gaap_ResidentialRealEstateMember_695" use="optional" order="27" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_MunicipalLeaseFinanceReceivablesMember" xlink:label="loc_cvbf_MunicipalLeaseFinanceReceivablesMember_697" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_672" xlink:to="loc_cvbf_MunicipalLeaseFinanceReceivablesMember_697" use="optional" order="28" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_SmallBusinessAdministrationLoansMember" xlink:label="loc_cvbf_SmallBusinessAdministrationLoansMember_690" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_672" xlink:to="loc_cvbf_SmallBusinessAdministrationLoansMember_690" use="optional" order="29" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.cvbfinancialcorp.com/role/LoansAndLeaseFinanceReceivablesAndAllowanceForCreditLossesSummaryOfRecordedInvestmentInCollateralDependentLoansDetail">
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_PledgedAssetsNotSeparatelyReportedOnStatementOfFinancialPositionLineItems" xlink:label="loc_cvbf_PledgedAssetsNotSeparatelyReportedOnStatementOfFinancialPositionLineItems_823687" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable" xlink:label="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_823648" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_cvbf_PledgedAssetsNotSeparatelyReportedOnStatementOfFinancialPositionLineItems_823687" xlink:to="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_823648" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_823649" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_823648" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_823649" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_823650" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_823649" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_823650" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_823650_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_823649" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_823650_default" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommercialRealEstateMember" xlink:label="loc_us-gaap_CommercialRealEstateMember_823651" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_823650" xlink:to="loc_us-gaap_CommercialRealEstateMember_823651" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ConstructionLoansMember" xlink:label="loc_us-gaap_ConstructionLoansMember_823653" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_823650" xlink:to="loc_us-gaap_ConstructionLoansMember_823653" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_ConsumerAndOtherLoansMember" xlink:label="loc_cvbf_ConsumerAndOtherLoansMember_823654" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_823650" xlink:to="loc_cvbf_ConsumerAndOtherLoansMember_823654" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_DairyLivestockAndAgribusinessMember" xlink:label="loc_cvbf_DairyLivestockAndAgribusinessMember_823655" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_823650" xlink:to="loc_cvbf_DairyLivestockAndAgribusinessMember_823655" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_CommercialAndIndustrialMember" xlink:label="loc_cvbf_CommercialAndIndustrialMember_823656" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_823650" xlink:to="loc_cvbf_CommercialAndIndustrialMember_823656" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_MunicipalLeaseFinanceReceivablesMember" xlink:label="loc_cvbf_MunicipalLeaseFinanceReceivablesMember_823663" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_823650" xlink:to="loc_cvbf_MunicipalLeaseFinanceReceivablesMember_823663" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_ConsumerMortgageMember" xlink:label="loc_cvbf_ConsumerMortgageMember_823667" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_823650" xlink:to="loc_cvbf_ConsumerMortgageMember_823667" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_PayCheckProtectionProgramMember" xlink:label="loc_cvbf_PayCheckProtectionProgramMember_823675" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_823650" xlink:to="loc_cvbf_PayCheckProtectionProgramMember_823675" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_SmallBusinessAdministrationLoansMember" xlink:label="loc_cvbf_SmallBusinessAdministrationLoansMember_823673" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_823650" xlink:to="loc_cvbf_SmallBusinessAdministrationLoansMember_823673" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_RecordedInvestmentInCollateralDependentLoansOnRealEstate" xlink:label="loc_cvbf_RecordedInvestmentInCollateralDependentLoansOnRealEstate_823689" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cvbf_PledgedAssetsNotSeparatelyReportedOnStatementOfFinancialPositionLineItems_823687" xlink:to="loc_cvbf_RecordedInvestmentInCollateralDependentLoansOnRealEstate_823689" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_RecordedInvestmentInCollateralDependentLoansOnBusinessAssets" xlink:label="loc_cvbf_RecordedInvestmentInCollateralDependentLoansOnBusinessAssets_823691" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cvbf_PledgedAssetsNotSeparatelyReportedOnStatementOfFinancialPositionLineItems_823687" xlink:to="loc_cvbf_RecordedInvestmentInCollateralDependentLoansOnBusinessAssets_823691" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_RecordedInvestmentInCollateralDependentLoansOnOtherFinancialInstruments" xlink:label="loc_cvbf_RecordedInvestmentInCollateralDependentLoansOnOtherFinancialInstruments_823696" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cvbf_PledgedAssetsNotSeparatelyReportedOnStatementOfFinancialPositionLineItems_823687" xlink:to="loc_cvbf_RecordedInvestmentInCollateralDependentLoansOnOtherFinancialInstruments_823696" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_NumberOfInstrumentsDependentOnCollateral" xlink:label="loc_cvbf_NumberOfInstrumentsDependentOnCollateral_823698" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cvbf_PledgedAssetsNotSeparatelyReportedOnStatementOfFinancialPositionLineItems_823687" xlink:to="loc_cvbf_NumberOfInstrumentsDependentOnCollateral_823698" use="optional" order="17" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.cvbfinancialcorp.com/role/LoansAndLeaseFinanceReceivablesAndAllowanceForCreditLossesSummaryOfActivityRelatedToTroubledDebtRestructuringsDetail">
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableModificationsLineItems" xlink:label="loc_us-gaap_FinancingReceivableModificationsLineItems_703" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfFinancingReceivableTroubledDebtRestructuringsTable" xlink:label="loc_us-gaap_ScheduleOfFinancingReceivableTroubledDebtRestructuringsTable_704" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FinancingReceivableModificationsLineItems_703" xlink:to="loc_us-gaap_ScheduleOfFinancingReceivableTroubledDebtRestructuringsTable_704" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancialInstrumentPerformanceStatusAxis" xlink:label="loc_us-gaap_FinancialInstrumentPerformanceStatusAxis_701" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableTroubledDebtRestructuringsTable_704" xlink:to="loc_us-gaap_FinancialInstrumentPerformanceStatusAxis_701" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancialInstrumentPerformanceStatusDomain" xlink:label="loc_us-gaap_FinancialInstrumentPerformanceStatusDomain_702" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentPerformanceStatusAxis_701" xlink:to="loc_us-gaap_FinancialInstrumentPerformanceStatusDomain_702" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancialInstrumentPerformanceStatusDomain" xlink:label="loc_us-gaap_FinancialInstrumentPerformanceStatusDomain_702_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentPerformanceStatusAxis_701" xlink:to="loc_us-gaap_FinancialInstrumentPerformanceStatusDomain_702_default" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_NonPerformingTroubledDebtRestructuredLoansMember" xlink:label="loc_cvbf_NonPerformingTroubledDebtRestructuredLoansMember_706" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentPerformanceStatusDomain_702" xlink:to="loc_cvbf_NonPerformingTroubledDebtRestructuredLoansMember_706" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_PerformingTroubledDebtRestructuringMember" xlink:label="loc_cvbf_PerformingTroubledDebtRestructuringMember_705" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentPerformanceStatusDomain_702" xlink:to="loc_cvbf_PerformingTroubledDebtRestructuringMember_705" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableModificationsRecordedInvestment" xlink:label="loc_us-gaap_FinancingReceivableModificationsRecordedInvestment_707" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableModificationsLineItems_703" xlink:to="loc_us-gaap_FinancingReceivableModificationsRecordedInvestment_707" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_FinancingReceivableModificationsRecordedInvestments" xlink:label="loc_cvbf_FinancingReceivableModificationsRecordedInvestments_714" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableModificationsLineItems_703" xlink:to="loc_cvbf_FinancingReceivableModificationsRecordedInvestments_714" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_FinancingReceivableRecordedInvestmentTroubledDebtRestructuringsAccrualStatus" xlink:label="loc_cvbf_FinancingReceivableRecordedInvestmentTroubledDebtRestructuringsAccrualStatus_711" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableModificationsLineItems_703" xlink:to="loc_cvbf_FinancingReceivableRecordedInvestmentTroubledDebtRestructuringsAccrualStatus_711" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_FinancingReceivablesImpairedTroubledDebtRestructuringAdditions" xlink:label="loc_cvbf_FinancingReceivablesImpairedTroubledDebtRestructuringAdditions_708" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableModificationsLineItems_703" xlink:to="loc_cvbf_FinancingReceivablesImpairedTroubledDebtRestructuringAdditions_708" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_FinancingReceivablesImpairedTroubledDebtRestructuringPayments" xlink:label="loc_cvbf_FinancingReceivablesImpairedTroubledDebtRestructuringPayments_710" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableModificationsLineItems_703" xlink:to="loc_cvbf_FinancingReceivablesImpairedTroubledDebtRestructuringPayments_710" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown" xlink:label="loc_us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown_709" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableModificationsLineItems_703" xlink:to="loc_us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown_709" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_FinancingReceivableRecordedInvestmentTroubledDebtRestructuringsNonAccrualStatus" xlink:label="loc_cvbf_FinancingReceivableRecordedInvestmentTroubledDebtRestructuringsNonAccrualStatus_712" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableModificationsLineItems_703" xlink:to="loc_cvbf_FinancingReceivableRecordedInvestmentTroubledDebtRestructuringsNonAccrualStatus_712" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransferToOtherRealEstate" xlink:label="loc_us-gaap_TransferToOtherRealEstate_417528" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableModificationsLineItems_703" xlink:to="loc_us-gaap_TransferToOtherRealEstate_417528" use="optional" order="14" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.cvbfinancialcorp.com/role/LoansAndLeaseFinanceReceivablesAndAllowanceForCreditLossesSummaryOfLoansModifiedAsTroubledDebtRestructuringsDetail">
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableModificationsLineItems" xlink:label="loc_us-gaap_FinancingReceivableModificationsLineItems_717" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_FinancingEffectsOfModificationsRecordedInvestment" xlink:label="loc_cvbf_FinancingEffectsOfModificationsRecordedInvestment_727" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableModificationsLineItems_717" xlink:to="loc_cvbf_FinancingEffectsOfModificationsRecordedInvestment_727" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_FinancingReceivableModificationsTroubledDebtRestructuringsTermModificationRecordedInvestment" xlink:label="loc_cvbf_FinancingReceivableModificationsTroubledDebtRestructuringsTermModificationRecordedInvestment_726" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableModificationsLineItems_717" xlink:to="loc_cvbf_FinancingReceivableModificationsTroubledDebtRestructuringsTermModificationRecordedInvestment_726" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfFinancingReceivableTroubledDebtRestructuringsTable" xlink:label="loc_us-gaap_ScheduleOfFinancingReceivableTroubledDebtRestructuringsTable_722" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FinancingReceivableModificationsLineItems_717" xlink:to="loc_us-gaap_ScheduleOfFinancingReceivableTroubledDebtRestructuringsTable_722" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_718" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableTroubledDebtRestructuringsTable_722" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_718" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_719" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_718" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_719" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_719_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_718" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_719_default" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_CommercialAndIndustrialLoansMember" xlink:label="loc_cvbf_CommercialAndIndustrialLoansMember_728" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_719" xlink:to="loc_cvbf_CommercialAndIndustrialLoansMember_728" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_CommercialRealEstateOwnerOccupiedMember" xlink:label="loc_cvbf_CommercialRealEstateOwnerOccupiedMember_730" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_719" xlink:to="loc_cvbf_CommercialRealEstateOwnerOccupiedMember_730" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_ConsumerMember" xlink:label="loc_cvbf_ConsumerMember_733" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_719" xlink:to="loc_cvbf_ConsumerMember_733" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_DairyLivestockAndAgribusinessMember" xlink:label="loc_cvbf_DairyLivestockAndAgribusinessMember_732" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_719" xlink:to="loc_cvbf_DairyLivestockAndAgribusinessMember_732" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ResidentialRealEstateMember" xlink:label="loc_us-gaap_ResidentialRealEstateMember_326675" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_719" xlink:to="loc_us-gaap_ResidentialRealEstateMember_326675" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LoanRestructuringModificationAxis" xlink:label="loc_us-gaap_LoanRestructuringModificationAxis_720" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableTroubledDebtRestructuringsTable_722" xlink:to="loc_us-gaap_LoanRestructuringModificationAxis_720" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LoanRestructuringModificationDomain" xlink:label="loc_us-gaap_LoanRestructuringModificationDomain_721" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LoanRestructuringModificationAxis_720" xlink:to="loc_us-gaap_LoanRestructuringModificationDomain_721" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LoanRestructuringModificationDomain" xlink:label="loc_us-gaap_LoanRestructuringModificationDomain_721_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LoanRestructuringModificationAxis_720" xlink:to="loc_us-gaap_LoanRestructuringModificationDomain_721_default" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_ChangeInAmortizationPeriodMember" xlink:label="loc_cvbf_ChangeInAmortizationPeriodMember_735" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoanRestructuringModificationDomain_721" xlink:to="loc_cvbf_ChangeInAmortizationPeriodMember_735" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ContractualInterestRateReductionMember" xlink:label="loc_us-gaap_ContractualInterestRateReductionMember_734" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoanRestructuringModificationDomain_721" xlink:to="loc_us-gaap_ContractualInterestRateReductionMember_734" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableModificationsNumberOfContracts2" xlink:label="loc_us-gaap_FinancingReceivableModificationsNumberOfContracts2_723" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableModificationsLineItems_717" xlink:to="loc_us-gaap_FinancingReceivableModificationsNumberOfContracts2_723" use="optional" order="17" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2" xlink:label="loc_us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2_725" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableModificationsLineItems_717" xlink:to="loc_us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2_725" use="optional" order="18" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2" xlink:label="loc_us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2_724" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableModificationsLineItems_717" xlink:to="loc_us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2_724" use="optional" order="19" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.cvbfinancialcorp.com/role/PremisesAndEquipmentAdditionalInformationDetail">
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_778" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_780" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_778" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_780" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_777" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_780" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_777" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_779" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_777" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_779" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_779_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_777" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_779_default" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GainLossOnSaleOfPropertyPlantEquipment" xlink:label="loc_us-gaap_GainLossOnSaleOfPropertyPlantEquipment_784" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_778" xlink:to="loc_us-gaap_GainLossOnSaleOfPropertyPlantEquipment_784" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_NumberOfBranches" xlink:label="loc_cvbf_NumberOfBranches_600941" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_778" xlink:to="loc_cvbf_NumberOfBranches_600941" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DepreciationAndAmortization" xlink:label="loc_us-gaap_DepreciationAndAmortization_600997" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_778" xlink:to="loc_us-gaap_DepreciationAndAmortization_600997" use="optional" order="7" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.cvbfinancialcorp.com/role/IncomeTaxesScheduleOfIncomeTaxAssetDetail">
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxContingencyLineItems" xlink:label="loc_us-gaap_IncomeTaxContingencyLineItems_821" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_IncomeTaxAssetNet" xlink:label="loc_cvbf_IncomeTaxAssetNet_827" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_821" xlink:to="loc_cvbf_IncomeTaxAssetNet_827" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_IncomeTaxAssetsCurrentAbstract" xlink:label="loc_cvbf_IncomeTaxAssetsCurrentAbstract_818" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_821" xlink:to="loc_cvbf_IncomeTaxAssetsCurrentAbstract_818" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_IncomeTaxAssetCurrent" xlink:label="loc_cvbf_IncomeTaxAssetCurrent_824" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cvbf_IncomeTaxAssetsCurrentAbstract_818" xlink:to="loc_cvbf_IncomeTaxAssetCurrent_824" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ComponentsOfDeferredTaxAssetsAbstract" xlink:label="loc_us-gaap_ComponentsOfDeferredTaxAssetsAbstract_817" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_821" xlink:to="loc_us-gaap_ComponentsOfDeferredTaxAssetsAbstract_817" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsNet" xlink:label="loc_us-gaap_DeferredTaxAssetsNet_823" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxAssetsAbstract_817" xlink:to="loc_us-gaap_DeferredTaxAssetsNet_823" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxContingencyTable" xlink:label="loc_us-gaap_IncomeTaxContingencyTable_822" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_821" xlink:to="loc_us-gaap_IncomeTaxContingencyTable_822" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxAuthorityAxis" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis_819" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxContingencyTable_822" xlink:to="loc_us-gaap_IncomeTaxAuthorityAxis_819" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxAuthorityDomain" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_820" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_819" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_820" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxAuthorityDomain" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_820_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_819" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_820_default" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DomesticCountryMember" xlink:label="loc_us-gaap_DomesticCountryMember_825" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_820" xlink:to="loc_us-gaap_DomesticCountryMember_825" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StateAndLocalJurisdictionMember" xlink:label="loc_us-gaap_StateAndLocalJurisdictionMember_826" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_820" xlink:to="loc_us-gaap_StateAndLocalJurisdictionMember_826" use="optional" order="11" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.cvbfinancialcorp.com/role/BorrowingsAdditionalInformationDetail">
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_903" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromIssuanceOfSubordinatedLongTermDebt" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfSubordinatedLongTermDebt_918" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_903" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfSubordinatedLongTermDebt_918" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_InvestmentBasisSpreadOnVariableRate" xlink:label="loc_cvbf_InvestmentBasisSpreadOnVariableRate_921" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_903" xlink:to="loc_cvbf_InvestmentBasisSpreadOnVariableRate_921" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LoansPledgedAsCollateral" xlink:label="loc_us-gaap_LoansPledgedAsCollateral_912" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_903" xlink:to="loc_us-gaap_LoansPledgedAsCollateral_912" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_MaximumPeriodOfDeferredPaymentsOfInterest" xlink:label="loc_cvbf_MaximumPeriodOfDeferredPaymentsOfInterest_919" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_903" xlink:to="loc_cvbf_MaximumPeriodOfDeferredPaymentsOfInterest_919" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_PeriodDuringInWhichInterestRateChangedToInterBankOfferingFloatingRate" xlink:label="loc_cvbf_PeriodDuringInWhichInterestRateChangedToInterBankOfferingFloatingRate_923" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_903" xlink:to="loc_cvbf_PeriodDuringInWhichInterestRateChangedToInterBankOfferingFloatingRate_923" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SecuritiesSoldUnderAgreementsToRepurchase" xlink:label="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchase_909" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_903" xlink:to="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchase_909" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="loc_us-gaap_DebtInstrumentTable_904" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_903" xlink:to="loc_us-gaap_DebtInstrumentTable_904" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_906" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_904" xlink:to="loc_dei_LegalEntityAxis_906" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_905" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_906" xlink:to="loc_dei_EntityDomain_905" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_905_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_906" xlink:to="loc_dei_EntityDomain_905_default" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_CvbStatutoryTrustThreeMember" xlink:label="loc_cvbf_CvbStatutoryTrustThreeMember_924" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_905" xlink:to="loc_cvbf_CvbStatutoryTrustThreeMember_924" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_907" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_904" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_907" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_908" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_907" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_908" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_908_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_907" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_908_default" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_JuniorSubordinatedDebentureHeldByCvbStatutoryTrustIiiMember" xlink:label="loc_cvbf_JuniorSubordinatedDebentureHeldByCvbStatutoryTrustIiiMember_925" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_908" xlink:to="loc_cvbf_JuniorSubordinatedDebentureHeldByCvbStatutoryTrustIiiMember_925" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CollateralAxis" xlink:label="loc_us-gaap_CollateralAxis_328098" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_904" xlink:to="loc_us-gaap_CollateralAxis_328098" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CollateralDomain" xlink:label="loc_us-gaap_CollateralDomain_328099" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CollateralAxis_328098" xlink:to="loc_us-gaap_CollateralDomain_328099" use="optional" order="17" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CollateralDomain" xlink:label="loc_us-gaap_CollateralDomain_328099_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CollateralAxis_328098" xlink:to="loc_us-gaap_CollateralDomain_328099_default" use="optional" order="18" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CollateralPledgedMember" xlink:label="loc_us-gaap_CollateralPledgedMember_328100" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CollateralDomain_328099" xlink:to="loc_us-gaap_CollateralPledgedMember_328100" use="optional" order="19" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtSecuritiesAvailableForSaleRestricted" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleRestricted_913" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_903" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleRestricted_913" use="optional" order="20" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_TrustPreferredSecuritiesCallableDate" xlink:label="loc_cvbf_TrustPreferredSecuritiesCallableDate_922" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_903" xlink:to="loc_cvbf_TrustPreferredSecuritiesCallableDate_922" use="optional" order="21" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_TrustPreferredSecuritiesIssuance" xlink:label="loc_cvbf_TrustPreferredSecuritiesIssuance_917" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_903" xlink:to="loc_cvbf_TrustPreferredSecuritiesIssuance_917" use="optional" order="22" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_WeightedAverageInterestRate" xlink:label="loc_cvbf_WeightedAverageInterestRate_910" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_903" xlink:to="loc_cvbf_WeightedAverageInterestRate_910" use="optional" order="23" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InvestmentMaturityDate" xlink:label="loc_us-gaap_InvestmentMaturityDate_569133" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_903" xlink:to="loc_us-gaap_InvestmentMaturityDate_569133" use="optional" order="24" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShortTermBorrowings" xlink:label="loc_us-gaap_ShortTermBorrowings_822952" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_903" xlink:to="loc_us-gaap_ShortTermBorrowings_822952" use="optional" order="25" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.cvbfinancialcorp.com/role/CommitmentsAndContingenciesAdditionalInformationDetail">
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_ContingenciesAndCommitmentsLineItems" xlink:label="loc_cvbf_ContingenciesAndCommitmentsLineItems_928" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_ReserveForUndisbursedCommitments" xlink:label="loc_cvbf_ReserveForUndisbursedCommitments_934" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cvbf_ContingenciesAndCommitmentsLineItems_928" xlink:to="loc_cvbf_ReserveForUndisbursedCommitments_934" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_CommitmentsToExtendCredit" xlink:label="loc_cvbf_CommitmentsToExtendCredit_932" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cvbf_ContingenciesAndCommitmentsLineItems_928" xlink:to="loc_cvbf_CommitmentsToExtendCredit_932" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_ContingenciesAndCommitmentsTable" xlink:label="loc_cvbf_ContingenciesAndCommitmentsTable_929" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_cvbf_ContingenciesAndCommitmentsLineItems_928" xlink:to="loc_cvbf_ContingenciesAndCommitmentsTable_929" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CreditFacilityAxis" xlink:label="loc_us-gaap_CreditFacilityAxis_930" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_cvbf_ContingenciesAndCommitmentsTable_929" xlink:to="loc_us-gaap_CreditFacilityAxis_930" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CreditFacilityDomain" xlink:label="loc_us-gaap_CreditFacilityDomain_931" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_930" xlink:to="loc_us-gaap_CreditFacilityDomain_931" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CreditFacilityDomain" xlink:label="loc_us-gaap_CreditFacilityDomain_931_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_930" xlink:to="loc_us-gaap_CreditFacilityDomain_931_default" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SecuredDebtMember" xlink:label="loc_us-gaap_SecuredDebtMember_938" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_931" xlink:to="loc_us-gaap_SecuredDebtMember_938" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LettersOfCreditOutstandingAmount" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_933" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cvbf_ContingenciesAndCommitmentsLineItems_928" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_933" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_935" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cvbf_ContingenciesAndCommitmentsLineItems_928" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_935" use="optional" order="9" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.cvbfinancialcorp.com/role/EmployeeBenefitPlansAdditionalInformationDetail">
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsLineItems" xlink:label="loc_us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsLineItems_941" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTitleOfIndividualAndByTypeOfDeferredCompensationTable" xlink:label="loc_us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTitleOfIndividualAndByTypeOfDeferredCompensationTable_946" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsLineItems_941" xlink:to="loc_us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTitleOfIndividualAndByTypeOfDeferredCompensationTable_946" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeAxis" xlink:label="loc_srt_RangeAxis_944" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTitleOfIndividualAndByTypeOfDeferredCompensationTable_946" xlink:to="loc_srt_RangeAxis_944" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_945" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_944" xlink:to="loc_srt_RangeMember_945" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_945_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_944" xlink:to="loc_srt_RangeMember_945_default" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis" xlink:label="loc_us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis_942" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTitleOfIndividualAndByTypeOfDeferredCompensationTable_946" xlink:to="loc_us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis_942" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherPostretirementBenefitsIndividualContractsTypeOfDeferredCompensationDomain" xlink:label="loc_us-gaap_OtherPostretirementBenefitsIndividualContractsTypeOfDeferredCompensationDomain_943" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis_942" xlink:to="loc_us-gaap_OtherPostretirementBenefitsIndividualContractsTypeOfDeferredCompensationDomain_943" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherPostretirementBenefitsIndividualContractsTypeOfDeferredCompensationDomain" xlink:label="loc_us-gaap_OtherPostretirementBenefitsIndividualContractsTypeOfDeferredCompensationDomain_943_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis_942" xlink:to="loc_us-gaap_OtherPostretirementBenefitsIndividualContractsTypeOfDeferredCompensationDomain_943_default" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_NonqualifiedExcessPlanMember" xlink:label="loc_cvbf_NonqualifiedExcessPlanMember_955" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherPostretirementBenefitsIndividualContractsTypeOfDeferredCompensationDomain_943" xlink:to="loc_cvbf_NonqualifiedExcessPlanMember_955" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense" xlink:label="loc_us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense_948" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsLineItems_941" xlink:to="loc_us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense_948" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredCompensationArrangementWithIndividualContributionsByEmployer" xlink:label="loc_us-gaap_DeferredCompensationArrangementWithIndividualContributionsByEmployer_951" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsLineItems_941" xlink:to="loc_us-gaap_DeferredCompensationArrangementWithIndividualContributionsByEmployer_951" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent" xlink:label="loc_us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent_952" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsLineItems_941" xlink:to="loc_us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent_952" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_EmployerContributionInProfitSharingPlan" xlink:label="loc_cvbf_EmployerContributionInProfitSharingPlan_954" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsLineItems_941" xlink:to="loc_cvbf_EmployerContributionInProfitSharingPlan_954" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_EmployerContributionPercentageEmployeeBenefitPlan" xlink:label="loc_cvbf_EmployerContributionPercentageEmployeeBenefitPlan_953" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsLineItems_941" xlink:to="loc_cvbf_EmployerContributionPercentageEmployeeBenefitPlan_953" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_PercentageOfAdditionalContributionUnderProfitSharingPlan" xlink:label="loc_cvbf_PercentageOfAdditionalContributionUnderProfitSharingPlan_845209" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsLineItems_941" xlink:to="loc_cvbf_PercentageOfAdditionalContributionUnderProfitSharingPlan_845209" use="optional" order="14" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.cvbfinancialcorp.com/role/StockBasedCompensationPlansAdditionalInformationDetail">
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_982" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_993" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_982" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_993" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_981" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_982" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_981" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_975" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_981" xlink:to="loc_us-gaap_AwardTypeAxis_975" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_983" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_975" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_983" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_983_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_975" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_983_default" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestrictedStockMember" xlink:label="loc_us-gaap_RestrictedStockMember_1011" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_983" xlink:to="loc_us-gaap_RestrictedStockMember_1011" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EmployeeStockOptionMember" xlink:label="loc_us-gaap_EmployeeStockOptionMember_1010" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_983" xlink:to="loc_us-gaap_EmployeeStockOptionMember_1010" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PlanNameAxis" xlink:label="loc_us-gaap_PlanNameAxis_977" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_981" xlink:to="loc_us-gaap_PlanNameAxis_977" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_978" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_977" xlink:to="loc_us-gaap_PlanNameDomain_978" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_978_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_977" xlink:to="loc_us-gaap_PlanNameDomain_978_default" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_EquityIncentivePlanTwoThousandEightMember" xlink:label="loc_cvbf_EquityIncentivePlanTwoThousandEightMember_986" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_978" xlink:to="loc_cvbf_EquityIncentivePlanTwoThousandEightMember_986" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_TwoThousandStockOptionPlanMember" xlink:label="loc_cvbf_TwoThousandStockOptionPlanMember_987" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_978" xlink:to="loc_cvbf_TwoThousandStockOptionPlanMember_987" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeAxis" xlink:label="loc_srt_RangeAxis_979" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_981" xlink:to="loc_srt_RangeAxis_979" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_980" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_979" xlink:to="loc_srt_RangeMember_980" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_980_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_979" xlink:to="loc_srt_RangeMember_980_default" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MinimumMember" xlink:label="loc_srt_MinimumMember_988" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_980" xlink:to="loc_srt_MinimumMember_988" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MaximumMember" xlink:label="loc_srt_MaximumMember_989" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_980" xlink:to="loc_srt_MaximumMember_989" use="optional" order="17" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_984" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_981" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_984" use="optional" order="18" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_976" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_984" xlink:to="loc_us-gaap_EquityComponentDomain_976" use="optional" order="19" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_976_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_984" xlink:to="loc_us-gaap_EquityComponentDomain_976_default" use="optional" order="20" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockMember" xlink:label="loc_us-gaap_CommonStockMember_985" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_976" xlink:to="loc_us-gaap_CommonStockMember_985" use="optional" order="21" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockSharesOutstanding" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_1001" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_982" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_1001" use="optional" order="22" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_997" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_982" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_997" use="optional" order="23" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromStockOptionsExercised" xlink:label="loc_us-gaap_ProceedsFromStockOptionsExercised_1000" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_982" xlink:to="loc_us-gaap_ProceedsFromStockOptionsExercised_1000" use="optional" order="24" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_998" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_982" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_998" use="optional" order="25" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_ShareBasedCompensationArrangementByShareBasedPaymentAwardExpirationYear" xlink:label="loc_cvbf_ShareBasedCompensationArrangementByShareBasedPaymentAwardExpirationYear_991" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_982" xlink:to="loc_cvbf_ShareBasedCompensationArrangementByShareBasedPaymentAwardExpirationYear_991" use="optional" order="26" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_1002" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_982" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_1002" use="optional" order="27" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_996" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_982" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_996" use="optional" order="28" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod_994" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_982" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod_994" use="optional" order="29" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_1005" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_982" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_1005" use="optional" order="30" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_1006" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_982" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_1006" use="optional" order="31" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit_1004" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_982" xlink:to="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit_1004" use="optional" order="32" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_992" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_982" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_992" use="optional" order="33" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1_999" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_982" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1_999" use="optional" order="34" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_995" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_982" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_995" use="optional" order="35" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionCompensationCost" xlink:label="loc_cvbf_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionCompensationCost_1008" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_982" xlink:to="loc_cvbf_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionCompensationCost_1008" use="optional" order="36" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_ShareBasedCompensationArrangementBySharesBasedPaymentAwardNumberOfSharesAuthorized" xlink:label="loc_cvbf_ShareBasedCompensationArrangementBySharesBasedPaymentAwardNumberOfSharesAuthorized_990" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_982" xlink:to="loc_cvbf_ShareBasedCompensationArrangementBySharesBasedPaymentAwardNumberOfSharesAuthorized_990" use="optional" order="37" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit_1003" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_982" xlink:to="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit_1003" use="optional" order="38" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.cvbfinancialcorp.com/role/StockBasedCompensationPlansEstimatedFairValueOfStockOptionsDetail">
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_1016" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_1018" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_1016" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_1018" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_1021" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_1016" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_1021" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_1019" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_1016" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_1019" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_1020" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_1016" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_1020" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_1015" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_1016" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_1015" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_1014" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_1015" xlink:to="loc_us-gaap_AwardTypeAxis_1014" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_1017" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_1014" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_1017" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_1017_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_1014" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_1017_default" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EmployeeStockOptionMember" xlink:label="loc_us-gaap_EmployeeStockOptionMember_1023" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_1017" xlink:to="loc_us-gaap_EmployeeStockOptionMember_1023" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_1022" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_1016" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_1022" use="optional" order="10" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.cvbfinancialcorp.com/role/StockBasedCompensationPlansSummaryOfStatusOfCompanysNonVestedRestrictedSharesDetail">
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_1050" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_1060" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_1050" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_1060" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_1058" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_1050" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_1058" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_1052" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_1050" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_1052" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_1049" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_1050" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_1049" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_1048" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_1049" xlink:to="loc_us-gaap_AwardTypeAxis_1048" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_1051" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_1048" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_1051" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_1051_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_1048" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_1051_default" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestrictedStockMember" xlink:label="loc_us-gaap_RestrictedStockMember_1062" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_1051" xlink:to="loc_us-gaap_RestrictedStockMember_1062" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_1055" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_1050" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_1055" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_1053" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_1050" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_1053" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_1057" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_1050" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_1057" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_1054" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_1050" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_1054" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_1059" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_1050" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_1059" use="optional" order="13" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.cvbfinancialcorp.com/role/RegulatoryMattersRegulatoryCapitalAmountsAndRatiosForCompanyAndBankDetail">
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems" xlink:label="loc_us-gaap_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems_1075" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Capital" xlink:label="loc_us-gaap_Capital_1081" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems_1075" xlink:to="loc_us-gaap_Capital_1081" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CapitalRequiredForCapitalAdequacy" xlink:label="loc_us-gaap_CapitalRequiredForCapitalAdequacy_1083" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems_1075" xlink:to="loc_us-gaap_CapitalRequiredForCapitalAdequacy_1083" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CapitalRequiredToBeWellCapitalized" xlink:label="loc_us-gaap_CapitalRequiredToBeWellCapitalized_1085" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems_1075" xlink:to="loc_us-gaap_CapitalRequiredToBeWellCapitalized_1085" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonEquityTierOneCapitalRequiredForCapitalAdequacy" xlink:label="loc_us-gaap_CommonEquityTierOneCapitalRequiredForCapitalAdequacy_1095" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems_1075" xlink:to="loc_us-gaap_CommonEquityTierOneCapitalRequiredForCapitalAdequacy_1095" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonEquityTierOneCapitalRequiredToBeWellCapitalized" xlink:label="loc_us-gaap_CommonEquityTierOneCapitalRequiredToBeWellCapitalized_1097" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems_1075" xlink:to="loc_us-gaap_CommonEquityTierOneCapitalRequiredToBeWellCapitalized_1097" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonEquityTierOneCapital" xlink:label="loc_us-gaap_CommonEquityTierOneCapital_1093" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems_1075" xlink:to="loc_us-gaap_CommonEquityTierOneCapital_1093" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_CommonEquityTierOneCapitalRatioRequiredForCapitalAdequacy" xlink:label="loc_cvbf_CommonEquityTierOneCapitalRatioRequiredForCapitalAdequacy_1096" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems_1075" xlink:to="loc_cvbf_CommonEquityTierOneCapitalRatioRequiredForCapitalAdequacy_1096" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_CommonEquityTierOneCapitalRatioRequiredToBeWellCapitalized" xlink:label="loc_cvbf_CommonEquityTierOneCapitalRatioRequiredToBeWellCapitalized_1098" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems_1075" xlink:to="loc_cvbf_CommonEquityTierOneCapitalRatioRequiredToBeWellCapitalized_1098" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy" xlink:label="loc_us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy_1089" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems_1075" xlink:to="loc_us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy_1089" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized" xlink:label="loc_us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized_1091" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems_1075" xlink:to="loc_us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized_1091" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsTable" xlink:label="loc_us-gaap_ScheduleOfComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsTable_1080" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems_1075" xlink:to="loc_us-gaap_ScheduleOfComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsTable_1080" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ConsolidatedEntitiesAxis" xlink:label="loc_srt_ConsolidatedEntitiesAxis_1076" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsTable_1080" xlink:to="loc_srt_ConsolidatedEntitiesAxis_1076" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ConsolidatedEntitiesDomain" xlink:label="loc_srt_ConsolidatedEntitiesDomain_1077" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_1076" xlink:to="loc_srt_ConsolidatedEntitiesDomain_1077" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ConsolidatedEntitiesDomain" xlink:label="loc_srt_ConsolidatedEntitiesDomain_1077_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_1076" xlink:to="loc_srt_ConsolidatedEntitiesDomain_1077_default" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_CitizensBusinessBankMember" xlink:label="loc_cvbf_CitizensBusinessBankMember_1106" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_1077" xlink:to="loc_cvbf_CitizensBusinessBankMember_1106" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ParentCompanyMember" xlink:label="loc_srt_ParentCompanyMember_1105" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_1077" xlink:to="loc_srt_ParentCompanyMember_1105" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeAxis" xlink:label="loc_srt_RangeAxis_1078" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsTable_1080" xlink:to="loc_srt_RangeAxis_1078" use="optional" order="17" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_1079" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_1078" xlink:to="loc_srt_RangeMember_1079" use="optional" order="18" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_1079_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_1078" xlink:to="loc_srt_RangeMember_1079_default" use="optional" order="19" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MinimumMember" xlink:label="loc_srt_MinimumMember_1107" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_1079" xlink:to="loc_srt_MinimumMember_1107" use="optional" order="20" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TierOneLeverageCapital" xlink:label="loc_us-gaap_TierOneLeverageCapital_1099" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems_1075" xlink:to="loc_us-gaap_TierOneLeverageCapital_1099" use="optional" order="21" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized" xlink:label="loc_us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized_1103" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems_1075" xlink:to="loc_us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized_1103" use="optional" order="22" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TierOneRiskBasedCapital" xlink:label="loc_us-gaap_TierOneRiskBasedCapital_1087" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems_1075" xlink:to="loc_us-gaap_TierOneRiskBasedCapital_1087" use="optional" order="23" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy" xlink:label="loc_us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy_1101" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems_1075" xlink:to="loc_us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy_1101" use="optional" order="24" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CapitalToRiskWeightedAssets" xlink:label="loc_us-gaap_CapitalToRiskWeightedAssets_827305" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems_1075" xlink:to="loc_us-gaap_CapitalToRiskWeightedAssets_827305" use="optional" order="25" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets" xlink:label="loc_us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets_827308" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems_1075" xlink:to="loc_us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets_827308" use="optional" order="26" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets" xlink:label="loc_us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets_827310" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems_1075" xlink:to="loc_us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets_827310" use="optional" order="27" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets" xlink:label="loc_us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets_827317" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems_1075" xlink:to="loc_us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets_827317" use="optional" order="28" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets" xlink:label="loc_us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets_827319" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems_1075" xlink:to="loc_us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets_827319" use="optional" order="29" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets" xlink:label="loc_us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets_827322" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems_1075" xlink:to="loc_us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets_827322" use="optional" order="30" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonEquityTierOneCapitalRatio" xlink:label="loc_us-gaap_CommonEquityTierOneCapitalRatio_827324" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems_1075" xlink:to="loc_us-gaap_CommonEquityTierOneCapitalRatio_827324" use="optional" order="31" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TierOneLeverageCapitalToAverageAssets" xlink:label="loc_us-gaap_TierOneLeverageCapitalToAverageAssets_827325" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems_1075" xlink:to="loc_us-gaap_TierOneLeverageCapitalToAverageAssets_827325" use="optional" order="32" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets" xlink:label="loc_us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets_827326" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems_1075" xlink:to="loc_us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets_827326" use="optional" order="33" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets" xlink:label="loc_us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets_827327" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems_1075" xlink:to="loc_us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets_827327" use="optional" order="34" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.cvbfinancialcorp.com/role/FairValueInformationAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetail">
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_1123" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AssetsFairValueDisclosure" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_1137" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_1123" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_1137" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecurities" xlink:label="loc_us-gaap_AvailableForSaleSecurities_1135" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_1123" xlink:to="loc_us-gaap_AvailableForSaleSecurities_1135" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeAssets" xlink:label="loc_us-gaap_DerivativeAssets_1136" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_1123" xlink:to="loc_us-gaap_DerivativeAssets_1136" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeLiabilities" xlink:label="loc_us-gaap_DerivativeLiabilities_1138" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_1123" xlink:to="loc_us-gaap_DerivativeLiabilities_1138" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_1124" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_1123" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_1124" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueByAssetClassAxis" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_1126" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_1124" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_1126" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_1125" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_1126" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_1125" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_1125_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_1126" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_1125_default" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CollateralizedMortgageObligationsMember" xlink:label="loc_us-gaap_CollateralizedMortgageObligationsMember_1141" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_1125" xlink:to="loc_us-gaap_CollateralizedMortgageObligationsMember_1141" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestRateSwapMember" xlink:label="loc_us-gaap_InterestRateSwapMember_1144" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_1125" xlink:to="loc_us-gaap_InterestRateSwapMember_1144" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_InvestmentSecuritiesMember" xlink:label="loc_cvbf_InvestmentSecuritiesMember_1143" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_1125" xlink:to="loc_cvbf_InvestmentSecuritiesMember_1143" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherDebtSecuritiesMember" xlink:label="loc_us-gaap_OtherDebtSecuritiesMember_1142" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_1125" xlink:to="loc_us-gaap_OtherDebtSecuritiesMember_1142" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_MortgageBackedSecuritiesMember" xlink:label="loc_us-gaap_MortgageBackedSecuritiesMember_1140" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_1125" xlink:to="loc_us-gaap_MortgageBackedSecuritiesMember_1140" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_1127" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_1124" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_1127" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_1132" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_1127" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_1132" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_1132_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_1127" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_1132_default" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_1149" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_1132" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_1149" use="optional" order="17" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_1150" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_1132" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_1150" use="optional" order="18" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_1151" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_1132" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_1151" use="optional" order="19" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueByMeasurementFrequencyAxis" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_1129" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_1124" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_1129" use="optional" order="20" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_1131" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_1129" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_1131" use="optional" order="21" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_1131_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_1129" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_1131_default" use="optional" order="22" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementsRecurringMember" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_1148" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_1131" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_1148" use="optional" order="23" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancialInstrumentAxis" xlink:label="loc_us-gaap_FinancialInstrumentAxis_1133" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_1124" xlink:to="loc_us-gaap_FinancialInstrumentAxis_1133" use="optional" order="24" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_1134" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_1133" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_1134" use="optional" order="25" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_1134_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_1133" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_1134_default" use="optional" order="26" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_USStatesAndPoliticalSubdivisionsMember" xlink:label="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_1152" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_1134" xlink:to="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_1152" use="optional" order="27" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueByMeasurementBasisAxis" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_316840" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_1124" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_316840" use="optional" order="28" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_316842" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_316840" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_316842" use="optional" order="29" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_316842_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_316840" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_316842_default" use="optional" order="30" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CarryingReportedAmountFairValueDisclosureMember" xlink:label="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_316844" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_316842" xlink:to="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_316844" use="optional" order="31" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LiabilitiesFairValueDisclosure" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_1139" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_1123" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosure_1139" use="optional" order="32" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.cvbfinancialcorp.com/role/FairValueInformationAssetsAndLiabilitiesMeasuredAtFairValueOnNonRecurringBasisDetail">
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_1159" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_1160" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_1159" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_1160" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisposalGroupClassificationAxis" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_1157" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_1160" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_1157" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisposalGroupClassificationDomain" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_1158" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_1157" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_1158" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisposalGroupClassificationDomain" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_1158_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_1157" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_1158_default" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember" xlink:label="loc_us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember_1171" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_1158" xlink:to="loc_us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember_1171" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_1161" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_1160" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_1161" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_1166" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_1161" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_1166" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_1166_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_1161" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_1166_default" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_1175" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_1166" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_1175" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_1176" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_1166" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_1176" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_1177" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_1166" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_1177" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueByMeasurementFrequencyAxis" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_1163" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_1160" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_1163" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_1165" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_1163" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_1165" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_1165_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_1163" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_1165_default" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementsNonrecurringMember" xlink:label="loc_us-gaap_FairValueMeasurementsNonrecurringMember_1174" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_1165" xlink:to="loc_us-gaap_FairValueMeasurementsNonrecurringMember_1174" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis" xlink:label="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_1155" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_1160" xlink:to="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_1155" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ReceivableTypeDomain" xlink:label="loc_us-gaap_ReceivableTypeDomain_1169" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_1155" xlink:to="loc_us-gaap_ReceivableTypeDomain_1169" use="optional" order="17" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ReceivableTypeDomain" xlink:label="loc_us-gaap_ReceivableTypeDomain_1169_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_1155" xlink:to="loc_us-gaap_ReceivableTypeDomain_1169_default" use="optional" order="18" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_LoansExcludingPurchasedCreditImpairedLoansMember" xlink:label="loc_cvbf_LoansExcludingPurchasedCreditImpairedLoansMember_1186" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReceivableTypeDomain_1169" xlink:to="loc_cvbf_LoansExcludingPurchasedCreditImpairedLoansMember_1186" use="optional" order="19" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_1167" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_1160" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_1167" use="optional" order="20" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_1168" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_1167" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_1168" use="optional" order="21" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_1168_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_1167" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_1168_default" use="optional" order="22" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ConstructionLoansMember" xlink:label="loc_us-gaap_ConstructionLoansMember_1181" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_1168" xlink:to="loc_us-gaap_ConstructionLoansMember_1181" use="optional" order="23" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_ConsumerAndOtherLoansMember" xlink:label="loc_cvbf_ConsumerAndOtherLoansMember_1184" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_1168" xlink:to="loc_cvbf_ConsumerAndOtherLoansMember_1184" use="optional" order="24" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_DairyLivestockAndAgribusinessMember" xlink:label="loc_cvbf_DairyLivestockAndAgribusinessMember_1183" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_1168" xlink:to="loc_cvbf_DairyLivestockAndAgribusinessMember_1183" use="optional" order="25" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_CommercialAndIndustrialLoansMember" xlink:label="loc_cvbf_CommercialAndIndustrialLoansMember_1178" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_1168" xlink:to="loc_cvbf_CommercialAndIndustrialLoansMember_1178" use="optional" order="26" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommercialRealEstateMember" xlink:label="loc_us-gaap_CommercialRealEstateMember_1180" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_1168" xlink:to="loc_us-gaap_CommercialRealEstateMember_1180" use="optional" order="27" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ResidentialRealEstateMember" xlink:label="loc_us-gaap_ResidentialRealEstateMember_1182" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_1168" xlink:to="loc_us-gaap_ResidentialRealEstateMember_1182" use="optional" order="28" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_OtherRealEstateOwnedMember" xlink:label="loc_cvbf_OtherRealEstateOwnedMember_1185" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_1168" xlink:to="loc_cvbf_OtherRealEstateOwnedMember_1185" use="optional" order="29" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_SmallBusinessAdministrationLoansMember" xlink:label="loc_cvbf_SmallBusinessAdministrationLoansMember_1179" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_1168" xlink:to="loc_cvbf_SmallBusinessAdministrationLoansMember_1179" use="optional" order="30" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_MunicipalLeaseFinanceReceivablesMember" xlink:label="loc_cvbf_MunicipalLeaseFinanceReceivablesMember_846013" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_1168" xlink:to="loc_cvbf_MunicipalLeaseFinanceReceivablesMember_846013" use="optional" order="31" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueByMeasurementBasisAxis" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_316888" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_1160" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_316888" use="optional" order="32" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_316889" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_316888" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_316889" use="optional" order="33" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_316889_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_316888" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_316889_default" use="optional" order="34" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CarryingReportedAmountFairValueDisclosureMember" xlink:label="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_316890" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_316889" xlink:to="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_316890" use="optional" order="35" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AssetsFairValueDisclosureAbstract" xlink:label="loc_us-gaap_AssetsFairValueDisclosureAbstract_1156" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_1159" xlink:to="loc_us-gaap_AssetsFairValueDisclosureAbstract_1156" use="optional" order="36" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AssetsFairValueDisclosure" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_1170" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_1156" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_1170" use="optional" order="37" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.cvbfinancialcorp.com/role/FairValueInformationEstimatedFairValueOfFinancialInstrumentsDetail">
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueConcentrationOfRiskFinancialStatementCaptionsLineItems" xlink:label="loc_us-gaap_FairValueConcentrationOfRiskFinancialStatementCaptionsLineItems_1192" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueConcentrationOfRiskTable" xlink:label="loc_us-gaap_FairValueConcentrationOfRiskTable_1193" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueConcentrationOfRiskFinancialStatementCaptionsLineItems_1192" xlink:to="loc_us-gaap_FairValueConcentrationOfRiskTable_1193" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_1190" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueConcentrationOfRiskTable_1193" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_1190" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_1195" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_1190" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_1195" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_1195_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_1190" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_1195_default" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_1203" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_1195" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_1203" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_1204" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_1195" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_1204" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_1205" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_1195" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_1205" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueByMeasurementBasisAxis" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_316915" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueConcentrationOfRiskTable_1193" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_316915" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_316916" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_316915" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_316916" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_316916_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_316915" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_316916_default" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CarryingReportedAmountFairValueDisclosureMember" xlink:label="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_316917" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_316916" xlink:to="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_316917" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_317338" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_316916" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_317338" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract" xlink:label="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_1196" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueConcentrationOfRiskFinancialStatementCaptionsLineItems_1192" xlink:to="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_1196" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_1209" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_1196" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_1209" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_1206" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_1196" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_1206" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeAssets" xlink:label="loc_us-gaap_DerivativeAssets_1212" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_1196" xlink:to="loc_us-gaap_DerivativeAssets_1212" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestBearingDepositsInBanks" xlink:label="loc_us-gaap_InterestBearingDepositsInBanks_1207" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_1196" xlink:to="loc_us-gaap_InterestBearingDepositsInBanks_1207" use="optional" order="17" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LoansAndLeasesReceivableNetReportedAmount" xlink:label="loc_us-gaap_LoansAndLeasesReceivableNetReportedAmount_1211" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_1196" xlink:to="loc_us-gaap_LoansAndLeasesReceivableNetReportedAmount_1211" use="optional" order="18" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HeldToMaturitySecurities" xlink:label="loc_us-gaap_HeldToMaturitySecurities_1210" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_1196" xlink:to="loc_us-gaap_HeldToMaturitySecurities_1210" use="optional" order="19" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract" xlink:label="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_1197" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueConcentrationOfRiskFinancialStatementCaptionsLineItems_1192" xlink:to="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_1197" use="optional" order="20" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtLongtermAndShorttermCombinedAmount" xlink:label="loc_us-gaap_DebtLongtermAndShorttermCombinedAmount_1213" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_1197" xlink:to="loc_us-gaap_DebtLongtermAndShorttermCombinedAmount_1213" use="optional" order="21" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DepositsAbstract" xlink:label="loc_us-gaap_DepositsAbstract_1189" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_1197" xlink:to="loc_us-gaap_DepositsAbstract_1189" use="optional" order="22" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestBearingDepositLiabilities" xlink:label="loc_us-gaap_InterestBearingDepositLiabilities_1199" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DepositsAbstract_1189" xlink:to="loc_us-gaap_InterestBearingDepositLiabilities_1199" use="optional" order="23" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeLiabilities" xlink:label="loc_us-gaap_DerivativeLiabilities_1215" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_1197" xlink:to="loc_us-gaap_DerivativeLiabilities_1215" use="optional" order="24" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust" xlink:label="loc_us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust_1214" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_1197" xlink:to="loc_us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust_1214" use="optional" order="25" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.cvbfinancialcorp.com/role/DerivativeFinancialInstrumentsAdditionalInformationDetail">
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossLineItems" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_1246" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeAssetNotionalAmount" xlink:label="loc_us-gaap_DerivativeAssetNotionalAmount_1250" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_1246" xlink:to="loc_us-gaap_DerivativeAssetNotionalAmount_1250" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_DerivativeAssetsLiabilitiesNetAmountOffsetInBalanceSheet" xlink:label="loc_cvbf_DerivativeAssetsLiabilitiesNetAmountOffsetInBalanceSheet_1249" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_1246" xlink:to="loc_cvbf_DerivativeAssetsLiabilitiesNetAmountOffsetInBalanceSheet_1249" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_1245" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_1246" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_1245" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_1244" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_1245" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_1244" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_1243" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_1244" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_1243" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_1243_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_1244" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_1243_default" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_InterestRateSwapAgreementsWithCustomersMember" xlink:label="loc_cvbf_InterestRateSwapAgreementsWithCustomersMember_1247" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_1243" xlink:to="loc_cvbf_InterestRateSwapAgreementsWithCustomersMember_1247" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NumberOfInterestRateDerivativesHeld" xlink:label="loc_us-gaap_NumberOfInterestRateDerivativesHeld_1248" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_1246" xlink:to="loc_us-gaap_NumberOfInterestRateDerivativesHeld_1248" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_DescriptionOfConditionsRelatingToClearingOfInterestRateSwaps" xlink:label="loc_cvbf_DescriptionOfConditionsRelatingToClearingOfInterestRateSwaps_422905" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_1246" xlink:to="loc_cvbf_DescriptionOfConditionsRelatingToClearingOfInterestRateSwaps_422905" use="optional" order="9" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.cvbfinancialcorp.com/role/DerivativeFinancialInstrumentsFairValueOfDerivativeInstrumentsDetail">
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativesFairValueLineItems" xlink:label="loc_us-gaap_DerivativesFairValueLineItems_1255" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeAsset" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_1263" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_1255" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_1263" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable" xlink:label="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_1258" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_1255" xlink:to="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_1258" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BalanceSheetLocationAxis" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_1253" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_1258" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_1253" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_1254" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_1253" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_1254" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_1254_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_1253" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_1254_default" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherAssetsMember" xlink:label="loc_us-gaap_OtherAssetsMember_1261" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_1254" xlink:to="loc_us-gaap_OtherAssetsMember_1261" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherLiabilitiesMember" xlink:label="loc_us-gaap_OtherLiabilitiesMember_1262" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_1254" xlink:to="loc_us-gaap_OtherLiabilitiesMember_1262" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueByAssetClassAxis" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_1257" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_1258" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_1257" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_1256" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_1257" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_1256" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_1256_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_1257" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_1256_default" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestRateSwapMember" xlink:label="loc_us-gaap_InterestRateSwapMember_1265" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_1256" xlink:to="loc_us-gaap_InterestRateSwapMember_1265" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HedgingDesignationAxis" xlink:label="loc_us-gaap_HedgingDesignationAxis_1259" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_1258" xlink:to="loc_us-gaap_HedgingDesignationAxis_1259" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HedgingDesignationDomain" xlink:label="loc_us-gaap_HedgingDesignationDomain_1260" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_1259" xlink:to="loc_us-gaap_HedgingDesignationDomain_1260" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HedgingDesignationDomain" xlink:label="loc_us-gaap_HedgingDesignationDomain_1260_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_1259" xlink:to="loc_us-gaap_HedgingDesignationDomain_1260_default" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NondesignatedMember" xlink:label="loc_us-gaap_NondesignatedMember_1266" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_1260" xlink:to="loc_us-gaap_NondesignatedMember_1266" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeLiability" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_1264" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_1255" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_1264" use="optional" order="16" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.cvbfinancialcorp.com/role/DerivativeFinancialInstrumentsEffectOfDerivativeInstrumentsOnConsolidatedStatementOfEarningsDetail">
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativesFairValueLineItems" xlink:label="loc_us-gaap_DerivativesFairValueLineItems_1269" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeGainOnDerivative" xlink:label="loc_us-gaap_DerivativeGainOnDerivative_1277" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_1269" xlink:to="loc_us-gaap_DerivativeGainOnDerivative_1277" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable" xlink:label="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_1272" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_1269" xlink:to="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_1272" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueByAssetClassAxis" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_1271" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_1272" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_1271" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_1270" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_1271" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_1270" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_1270_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_1271" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_1270_default" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestRateSwapMember" xlink:label="loc_us-gaap_InterestRateSwapMember_1278" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_1270" xlink:to="loc_us-gaap_InterestRateSwapMember_1278" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HedgingDesignationAxis" xlink:label="loc_us-gaap_HedgingDesignationAxis_1273" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_1272" xlink:to="loc_us-gaap_HedgingDesignationAxis_1273" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HedgingDesignationDomain" xlink:label="loc_us-gaap_HedgingDesignationDomain_1274" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_1273" xlink:to="loc_us-gaap_HedgingDesignationDomain_1274" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HedgingDesignationDomain" xlink:label="loc_us-gaap_HedgingDesignationDomain_1274_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_1273" xlink:to="loc_us-gaap_HedgingDesignationDomain_1274_default" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NondesignatedMember" xlink:label="loc_us-gaap_NondesignatedMember_1279" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_1274" xlink:to="loc_us-gaap_NondesignatedMember_1279" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeStatementLocationAxis" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_1275" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_1272" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_1275" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_1276" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_1275" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_1276" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_1276_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_1275" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_1276_default" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherIncomeMember" xlink:label="loc_us-gaap_OtherIncomeMember_1280" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_1276" xlink:to="loc_us-gaap_OtherIncomeMember_1280" use="optional" order="14" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.cvbfinancialcorp.com/role/BalanceSheetOffsettingScheduleOfBalanceSheetOffsettingDetail">
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_OffsettingAssetsLiabilitiesLineItems" xlink:label="loc_cvbf_OffsettingAssetsLiabilitiesLineItems_1301" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeCollateralRightToReclaimCash" xlink:label="loc_us-gaap_DerivativeCollateralRightToReclaimCash_1317" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cvbf_OffsettingAssetsLiabilitiesLineItems_1301" xlink:to="loc_us-gaap_DerivativeCollateralRightToReclaimCash_1317" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeCollateralRightToReclaimSecurities" xlink:label="loc_us-gaap_DerivativeCollateralRightToReclaimSecurities_1316" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cvbf_OffsettingAssetsLiabilitiesLineItems_1301" xlink:to="loc_us-gaap_DerivativeCollateralRightToReclaimSecurities_1316" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral_1307" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cvbf_OffsettingAssetsLiabilitiesLineItems_1301" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral_1307" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral_1312" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cvbf_OffsettingAssetsLiabilitiesLineItems_1301" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral_1312" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral_1313" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cvbf_OffsettingAssetsLiabilitiesLineItems_1301" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral_1313" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeAssets" xlink:label="loc_us-gaap_DerivativeAssets_1309" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cvbf_OffsettingAssetsLiabilitiesLineItems_1301" xlink:to="loc_us-gaap_DerivativeAssets_1309" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeCollateralObligationToReturnCash" xlink:label="loc_us-gaap_DerivativeCollateralObligationToReturnCash_1311" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cvbf_OffsettingAssetsLiabilitiesLineItems_1301" xlink:to="loc_us-gaap_DerivativeCollateralObligationToReturnCash_1311" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeCollateralObligationToReturnSecurities" xlink:label="loc_us-gaap_DerivativeCollateralObligationToReturnSecurities_1310" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cvbf_OffsettingAssetsLiabilitiesLineItems_1301" xlink:to="loc_us-gaap_DerivativeCollateralObligationToReturnSecurities_1310" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeLiabilities" xlink:label="loc_us-gaap_DerivativeLiabilities_1315" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cvbf_OffsettingAssetsLiabilitiesLineItems_1301" xlink:to="loc_us-gaap_DerivativeLiabilities_1315" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset" xlink:label="loc_us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset_1314" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cvbf_OffsettingAssetsLiabilitiesLineItems_1301" xlink:to="loc_us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset_1314" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral_1318" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cvbf_OffsettingAssetsLiabilitiesLineItems_1301" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral_1318" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset" xlink:label="loc_us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset_1308" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cvbf_OffsettingAssetsLiabilitiesLineItems_1301" xlink:to="loc_us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset_1308" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_OffsettingAssetsLiabilitiesTable" xlink:label="loc_cvbf_OffsettingAssetsLiabilitiesTable_1302" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_cvbf_OffsettingAssetsLiabilitiesLineItems_1301" xlink:to="loc_cvbf_OffsettingAssetsLiabilitiesTable_1302" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueByAssetClassAxis" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_1298" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_cvbf_OffsettingAssetsLiabilitiesTable_1302" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_1298" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_1297" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_1298" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_1297" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_1297_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_1298" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_1297_default" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestRateSwapMember" xlink:label="loc_us-gaap_InterestRateSwapMember_1305" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_1297" xlink:to="loc_us-gaap_InterestRateSwapMember_1305" use="optional" order="17" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HedgingDesignationAxis" xlink:label="loc_us-gaap_HedgingDesignationAxis_1299" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_cvbf_OffsettingAssetsLiabilitiesTable_1302" xlink:to="loc_us-gaap_HedgingDesignationAxis_1299" use="optional" order="18" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HedgingDesignationDomain" xlink:label="loc_us-gaap_HedgingDesignationDomain_1300" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_1299" xlink:to="loc_us-gaap_HedgingDesignationDomain_1300" use="optional" order="19" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HedgingDesignationDomain" xlink:label="loc_us-gaap_HedgingDesignationDomain_1300_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_1299" xlink:to="loc_us-gaap_HedgingDesignationDomain_1300_default" use="optional" order="20" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NondesignatedMember" xlink:label="loc_us-gaap_NondesignatedMember_1306" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_1300" xlink:to="loc_us-gaap_NondesignatedMember_1306" use="optional" order="21" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShortTermDebtTypeAxis" xlink:label="loc_us-gaap_ShortTermDebtTypeAxis_1303" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_cvbf_OffsettingAssetsLiabilitiesTable_1302" xlink:to="loc_us-gaap_ShortTermDebtTypeAxis_1303" use="optional" order="22" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShortTermDebtTypeDomain" xlink:label="loc_us-gaap_ShortTermDebtTypeDomain_1304" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ShortTermDebtTypeAxis_1303" xlink:to="loc_us-gaap_ShortTermDebtTypeDomain_1304" use="optional" order="23" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShortTermDebtTypeDomain" xlink:label="loc_us-gaap_ShortTermDebtTypeDomain_1304_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ShortTermDebtTypeAxis_1303" xlink:to="loc_us-gaap_ShortTermDebtTypeDomain_1304_default" use="optional" order="24" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember" xlink:label="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember_1319" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtTypeDomain_1304" xlink:to="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember_1319" use="optional" order="25" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.cvbfinancialcorp.com/role/LeasesComponentsOfLeaseCostsAndSupplementalInformationRelatedToLeasesDetail">
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_417493" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_417490" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_417493" xlink:to="loc_us-gaap_StatementTable_417490" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_417491" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_417490" xlink:to="loc_us-gaap_StatementClassOfStockAxis_417491" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_417492" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_417491" xlink:to="loc_us-gaap_ClassOfStockDomain_417492" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_417492_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_417491" xlink:to="loc_us-gaap_ClassOfStockDomain_417492_default" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_LeaseTermAndDiscountRateAbstract" xlink:label="loc_cvbf_LeaseTermAndDiscountRateAbstract_417504" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_417493" xlink:to="loc_cvbf_LeaseTermAndDiscountRateAbstract_417504" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1" xlink:label="loc_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_417505" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cvbf_LeaseTermAndDiscountRateAbstract_417504" xlink:to="loc_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_417505" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent" xlink:label="loc_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_417506" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cvbf_LeaseTermAndDiscountRateAbstract_417504" xlink:to="loc_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_417506" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AssetsAndLiabilitiesLesseeAbstract" xlink:label="loc_us-gaap_AssetsAndLiabilitiesLesseeAbstract_417494" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_417493" xlink:to="loc_us-gaap_AssetsAndLiabilitiesLesseeAbstract_417494" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_417495" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAndLiabilitiesLesseeAbstract_417494" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_417495" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_417497" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAndLiabilitiesLesseeAbstract_417494" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_417497" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LeaseCostAbstract" xlink:label="loc_us-gaap_LeaseCostAbstract_417498" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_417493" xlink:to="loc_us-gaap_LeaseCostAbstract_417498" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseExpense" xlink:label="loc_us-gaap_OperatingLeaseExpense_417499" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LeaseCostAbstract_417498" xlink:to="loc_us-gaap_OperatingLeaseExpense_417499" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LeaseCost" xlink:label="loc_us-gaap_LeaseCost_417501" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LeaseCostAbstract_417498" xlink:to="loc_us-gaap_LeaseCost_417501" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_LeaseOtherInformationAbstract" xlink:label="loc_cvbf_LeaseOtherInformationAbstract_417502" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_417493" xlink:to="loc_cvbf_LeaseOtherInformationAbstract_417502" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeasePayments" xlink:label="loc_us-gaap_OperatingLeasePayments_417503" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cvbf_LeaseOtherInformationAbstract_417502" xlink:to="loc_us-gaap_OperatingLeasePayments_417503" use="optional" order="15" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.cvbfinancialcorp.com/role/LeasesFutureLeasePaymentsRequiredForLeasesThatHaveInitialOrRemainingNonCancelableLeaseTermsDetail">
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_417514" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_417511" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_417514" xlink:to="loc_us-gaap_StatementTable_417511" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_417512" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_417511" xlink:to="loc_us-gaap_StatementClassOfStockAxis_417512" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_417513" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_417512" xlink:to="loc_us-gaap_ClassOfStockDomain_417513" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_417513_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_417512" xlink:to="loc_us-gaap_ClassOfStockDomain_417513_default" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_417517" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_417514" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_417517" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_417518" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_417514" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_417518" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_417519" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_417514" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_417519" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_417520" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_417514" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_417520" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_417521" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_417514" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_417521" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_417523" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_417514" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_417523" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseLiability" xlink:label="loc_us-gaap_OperatingLeaseLiability_417524" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_417514" xlink:to="loc_us-gaap_OperatingLeaseLiability_417524" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDue" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_417522" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_417514" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_417522" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourAndFiveYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourAndFiveYears_823064" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_417514" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourAndFiveYears_823064" use="optional" order="13" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.cvbfinancialcorp.com/role/RevenueRecognitionSummaryOfNonInterestIncomeSegregatedByRevenueStreamsInScopeAndOutOfScopeOfTopic606Detail">
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisaggregationOfRevenueLineItems" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_326544" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisaggregationOfRevenueTable" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_326541" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_326544" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_326541" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AdjustmentsForNewAccountingPronouncementsAxis" xlink:label="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_326549" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_326541" xlink:to="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_326549" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TypeOfAdoptionMember" xlink:label="loc_us-gaap_TypeOfAdoptionMember_326550" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_326549" xlink:to="loc_us-gaap_TypeOfAdoptionMember_326550" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TypeOfAdoptionMember" xlink:label="loc_us-gaap_TypeOfAdoptionMember_326550_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_326549" xlink:to="loc_us-gaap_TypeOfAdoptionMember_326550_default" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountingStandardsUpdate201409Member" xlink:label="loc_us-gaap_AccountingStandardsUpdate201409Member_326551" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfAdoptionMember_326550" xlink:to="loc_us-gaap_AccountingStandardsUpdate201409Member_326551" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_AccountingStandardsUpdate201409NotAdoptedMember" xlink:label="loc_cvbf_AccountingStandardsUpdate201409NotAdoptedMember_326552" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfAdoptionMember_326550" xlink:to="loc_cvbf_AccountingStandardsUpdate201409NotAdoptedMember_326552" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ProductOrServiceAxis" xlink:label="loc_srt_ProductOrServiceAxis_326553" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_326541" xlink:to="loc_srt_ProductOrServiceAxis_326553" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ProductsAndServicesDomain" xlink:label="loc_srt_ProductsAndServicesDomain_326554" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_326553" xlink:to="loc_srt_ProductsAndServicesDomain_326554" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ProductsAndServicesDomain" xlink:label="loc_srt_ProductsAndServicesDomain_326554_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_326553" xlink:to="loc_srt_ProductsAndServicesDomain_326554_default" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DepositAccountMember" xlink:label="loc_us-gaap_DepositAccountMember_326555" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_326554" xlink:to="loc_us-gaap_DepositAccountMember_326555" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiduciaryAndTrustMember" xlink:label="loc_us-gaap_FiduciaryAndTrustMember_326556" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_326554" xlink:to="loc_us-gaap_FiduciaryAndTrustMember_326556" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CreditCardMember" xlink:label="loc_us-gaap_CreditCardMember_326558" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_326554" xlink:to="loc_us-gaap_CreditCardMember_326558" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NoninterestIncomeAbstract" xlink:label="loc_us-gaap_NoninterestIncomeAbstract_326559" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_326544" xlink:to="loc_us-gaap_NoninterestIncomeAbstract_326559" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_326560" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestIncomeAbstract_326559" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_326560" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GainsLossesOnSalesOfOtherRealEstate" xlink:label="loc_us-gaap_GainsLossesOnSalesOfOtherRealEstate_326562" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestIncomeAbstract_326559" xlink:to="loc_us-gaap_GainsLossesOnSalesOfOtherRealEstate_326562" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NoninterestIncomeOther" xlink:label="loc_us-gaap_NoninterestIncomeOther_326563" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestIncomeAbstract_326559" xlink:to="loc_us-gaap_NoninterestIncomeOther_326563" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NoninterestIncome" xlink:label="loc_us-gaap_NoninterestIncome_326565" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestIncomeAbstract_326559" xlink:to="loc_us-gaap_NoninterestIncome_326565" use="optional" order="17" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.cvbfinancialcorp.com/role/CondensedFinancialInformationOfParentCompanyCondensedBalanceSheetsDetail">
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_CondensedFinancialStatementsCaptionsLineItems" xlink:label="loc_srt_CondensedFinancialStatementsCaptionsLineItems_1323" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AssetsAbstract" xlink:label="loc_us-gaap_AssetsAbstract_1322" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedFinancialStatementsCaptionsLineItems_1323" xlink:to="loc_us-gaap_AssetsAbstract_1322" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures" xlink:label="loc_us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures_1327" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_1322" xlink:to="loc_us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures_1327" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_1329" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_1322" xlink:to="loc_us-gaap_Assets_1329" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherAssets" xlink:label="loc_us-gaap_OtherAssets_1328" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_1322" xlink:to="loc_us-gaap_OtherAssets_1328" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Liabilities" xlink:label="loc_us-gaap_Liabilities_1330" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedFinancialStatementsCaptionsLineItems_1323" xlink:to="loc_us-gaap_Liabilities_1330" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_1332" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedFinancialStatementsCaptionsLineItems_1323" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_1332" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ScheduleOfCondensedFinancialStatementsTable" xlink:label="loc_srt_ScheduleOfCondensedFinancialStatementsTable_1326" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_srt_CondensedFinancialStatementsCaptionsLineItems_1323" xlink:to="loc_srt_ScheduleOfCondensedFinancialStatementsTable_1326" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ConsolidatedEntitiesAxis" xlink:label="loc_srt_ConsolidatedEntitiesAxis_1324" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_srt_ScheduleOfCondensedFinancialStatementsTable_1326" xlink:to="loc_srt_ConsolidatedEntitiesAxis_1324" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ConsolidatedEntitiesDomain" xlink:label="loc_srt_ConsolidatedEntitiesDomain_1325" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_1324" xlink:to="loc_srt_ConsolidatedEntitiesDomain_1325" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ConsolidatedEntitiesDomain" xlink:label="loc_srt_ConsolidatedEntitiesDomain_1325_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_1324" xlink:to="loc_srt_ConsolidatedEntitiesDomain_1325_default" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ParentCompanyMember" xlink:label="loc_srt_ParentCompanyMember_1333" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_1325" xlink:to="loc_srt_ParentCompanyMember_1333" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_1331" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedFinancialStatementsCaptionsLineItems_1323" xlink:to="loc_us-gaap_StockholdersEquity_1331" use="optional" order="12" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.cvbfinancialcorp.com/role/CondensedFinancialInformationOfParentCompanyCondensedStatementsOfEarningsDetail">
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_CondensedFinancialStatementsCaptionsLineItems" xlink:label="loc_srt_CondensedFinancialStatementsCaptionsLineItems_1336" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NoninterestExpense" xlink:label="loc_us-gaap_NoninterestExpense_1342" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedFinancialStatementsCaptionsLineItems_1336" xlink:to="loc_us-gaap_NoninterestExpense_1342" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ScheduleOfCondensedFinancialStatementsTable" xlink:label="loc_srt_ScheduleOfCondensedFinancialStatementsTable_1339" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_srt_CondensedFinancialStatementsCaptionsLineItems_1336" xlink:to="loc_srt_ScheduleOfCondensedFinancialStatementsTable_1339" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ConsolidatedEntitiesAxis" xlink:label="loc_srt_ConsolidatedEntitiesAxis_1337" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_srt_ScheduleOfCondensedFinancialStatementsTable_1339" xlink:to="loc_srt_ConsolidatedEntitiesAxis_1337" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ConsolidatedEntitiesDomain" xlink:label="loc_srt_ConsolidatedEntitiesDomain_1338" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_1337" xlink:to="loc_srt_ConsolidatedEntitiesDomain_1338" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ConsolidatedEntitiesDomain" xlink:label="loc_srt_ConsolidatedEntitiesDomain_1338_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_1337" xlink:to="loc_srt_ConsolidatedEntitiesDomain_1338_default" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ParentCompanyMember" xlink:label="loc_srt_ParentCompanyMember_1344" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_1338" xlink:to="loc_srt_ParentCompanyMember_1344" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeLossFromSubsidiariesNetOfTax" xlink:label="loc_us-gaap_IncomeLossFromSubsidiariesNetOfTax_1340" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedFinancialStatementsCaptionsLineItems_1336" xlink:to="loc_us-gaap_IncomeLossFromSubsidiariesNetOfTax_1340" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InvestmentIncomeDividend" xlink:label="loc_us-gaap_InvestmentIncomeDividend_1341" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedFinancialStatementsCaptionsLineItems_1336" xlink:to="loc_us-gaap_InvestmentIncomeDividend_1341" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_1343" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedFinancialStatementsCaptionsLineItems_1336" xlink:to="loc_us-gaap_NetIncomeLoss_1343" use="optional" order="9" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.cvbfinancialcorp.com/role/CondensedFinancialInformationOfParentCompanyCondensedStatementsOfCashFlowsDetail">
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_CondensedFinancialStatementsCaptionsLineItems" xlink:label="loc_srt_CondensedFinancialStatementsCaptionsLineItems_1348" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_1361" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedFinancialStatementsCaptionsLineItems_1348" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_1361" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease" xlink:label="loc_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_1360" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedFinancialStatementsCaptionsLineItems_1348" xlink:to="loc_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_1360" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_1351" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedFinancialStatementsCaptionsLineItems_1348" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_1351" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_1368" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_1351" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_1368" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsOfDividendsCommonStock" xlink:label="loc_us-gaap_PaymentsOfDividendsCommonStock_1364" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_1351" xlink:to="loc_us-gaap_PaymentsOfDividendsCommonStock_1364" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromStockOptionsExercised" xlink:label="loc_us-gaap_ProceedsFromStockOptionsExercised_1365" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_1351" xlink:to="loc_us-gaap_ProceedsFromStockOptionsExercised_1365" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_1367" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_1351" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_1367" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_1352" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedFinancialStatementsCaptionsLineItems_1348" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_1352" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_DividendsReceivedFromBank" xlink:label="loc_cvbf_DividendsReceivedFromBank_1369" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_1352" xlink:to="loc_cvbf_DividendsReceivedFromBank_1369" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_1370" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_1352" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_1370" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ScheduleOfCondensedFinancialStatementsTable" xlink:label="loc_srt_ScheduleOfCondensedFinancialStatementsTable_1354" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_srt_CondensedFinancialStatementsCaptionsLineItems_1348" xlink:to="loc_srt_ScheduleOfCondensedFinancialStatementsTable_1354" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ConsolidatedEntitiesAxis" xlink:label="loc_srt_ConsolidatedEntitiesAxis_1349" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_srt_ScheduleOfCondensedFinancialStatementsTable_1354" xlink:to="loc_srt_ConsolidatedEntitiesAxis_1349" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ConsolidatedEntitiesDomain" xlink:label="loc_srt_ConsolidatedEntitiesDomain_1350" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_1349" xlink:to="loc_srt_ConsolidatedEntitiesDomain_1350" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ConsolidatedEntitiesDomain" xlink:label="loc_srt_ConsolidatedEntitiesDomain_1350_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_1349" xlink:to="loc_srt_ConsolidatedEntitiesDomain_1350_default" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ParentCompanyMember" xlink:label="loc_srt_ParentCompanyMember_1363" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_1350" xlink:to="loc_srt_ParentCompanyMember_1363" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_1353" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedFinancialStatementsCaptionsLineItems_1348" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_1353" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_1347" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_1353" xlink:to="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_1347" use="optional" order="17" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities_1359" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_1347" xlink:to="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities_1359" use="optional" order="18" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensation" xlink:label="loc_us-gaap_ShareBasedCompensation_1357" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_1347" xlink:to="loc_us-gaap_ShareBasedCompensation_1357" use="optional" order="19" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_EarningsOfSubsidiaries" xlink:label="loc_cvbf_EarningsOfSubsidiaries_1355" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_1347" xlink:to="loc_cvbf_EarningsOfSubsidiaries_1355" use="optional" order="20" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherOperatingActivitiesCashFlowStatement" xlink:label="loc_us-gaap_OtherOperatingActivitiesCashFlowStatement_1358" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_1347" xlink:to="loc_us-gaap_OtherOperatingActivitiesCashFlowStatement_1358" use="optional" order="21" />
<loc xlink:type="locator" xlink:href="cvbf-20201231.xsd#cvbf_TaxSettlementReceivedFromBank" xlink:label="loc_cvbf_TaxSettlementReceivedFromBank_1356" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_1347" xlink:to="loc_cvbf_TaxSettlementReceivedFromBank_1356" use="optional" order="22" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_1371" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_1353" xlink:to="loc_us-gaap_ProfitLoss_1371" use="optional" order="23" />
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_1372" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_1353" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_1372" use="optional" order="24" />
</definitionLink>
</linkbase>
