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<!-- Round: 11 -->
<!-- Creation date: 2014-02-27T15:38:44Z -->
<!-- Copyright (c) 2005-2013 R.R. Donnelley &amp; Sons Company All Rights Reserved. -->
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        <link:definition>170 - Disclosure - Future Minimum Lease Payments under Non-Cancelable Operating Leases (Detail)</link:definition>
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        <link:definition>171 - Disclosure - Related Party Transactions - Additional Information (Detail)</link:definition>
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        <link:definition>172 - Disclosure - Revenues and Long-Lived Assets by Geographical Area (Detail)</link:definition>
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  <element name="FairValueOfSharesIssuedToPartyOfJointVenture" id="wso_FairValueOfSharesIssuedToPartyOfJointVenture" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FinancialInstrumentLineItems" id="wso_FinancialInstrumentLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FinancialInstrumentsTable" id="wso_FinancialInstrumentsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="FourZeroOneKPlanMember" id="wso_FourZeroOneKPlanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="GeographicAreaInformationLineItems" id="wso_GeographicAreaInformationLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="GeographicAreaInformationTable" id="wso_GeographicAreaInformationTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="GeographicAreaInformationTextBlock" id="wso_GeographicAreaInformationTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="GoodwillAndIntangibleAssetsLineItems" id="wso_GoodwillAndIntangibleAssetsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="GoodwillAndIntangibleAssetsTable" id="wso_GoodwillAndIntangibleAssetsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="GoodwillAndOtherIntangibleAssetsLineItems" id="wso_GoodwillAndOtherIntangibleAssetsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="GoodwillForeignExchangeAndOtherAdjustments" id="wso_GoodwillForeignExchangeAndOtherAdjustments" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="GoodwillPeriodAvailableForTaxDeductions" id="wso_GoodwillPeriodAvailableForTaxDeductions" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IncomeTaxesLineItems" id="wso_IncomeTaxesLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IntangibleAssetsLineItems" id="wso_IntangibleAssetsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MulticurrencyBorrowingSublimitMember" id="wso_MulticurrencyBorrowingSublimitMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NatureOfOperationsPolicyTextBlock" id="wso_NatureOfOperationsPolicyTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NetSharesAwardedUnderCompensationPlan" id="wso_NetSharesAwardedUnderCompensationPlan" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NonCashContributionTo401KPlan" id="wso_NonCashContributionTo401KPlan" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumberOfJointVentures" id="wso_NumberOfJointVentures" type="xbrli:integerItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumberOfKeySuppliers" id="wso_NumberOfKeySuppliers" type="xbrli:integerItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumberOfLocationsContributedToJointVentureByControllingInterest" id="wso_NumberOfLocationsContributedToJointVentureByControllingInterest" type="xbrli:integerItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumberOfLocationsContributedToJointVentureByNoncontrollingInterest" id="wso_NumberOfLocationsContributedToJointVentureByNoncontrollingInterest" type="xbrli:integerItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OperatingLeasesFutureMinimumPaymentsDueLineItems" id="wso_OperatingLeasesFutureMinimumPaymentsDueLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OperatingLeasesFutureMinimumPaymentsDueTable" id="wso_OperatingLeasesFutureMinimumPaymentsDueTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="OperatingLeasesMaximumMaturityDate" id="wso_OperatingLeasesMaximumMaturityDate" type="us-types:dateStringItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OperatingLossCarryforwardExpirationYear" id="wso_OperatingLossCarryforwardExpirationYear" type="xbrli:gYearItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OptionToPurchaseAdditionalInterestPercentage" id="wso_OptionToPurchaseAdditionalInterestPercentage" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OtherComprehensiveIncomeLossTable" id="wso_OtherComprehensiveIncomeLossTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="OtherDepreciableAssetsMember" id="wso_OtherDepreciableAssetsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ParticipatingSecuritiesDistributedAndUndistributedEarningsAfterDilution" id="wso_ParticipatingSecuritiesDistributedAndUndistributedEarningsAfterDilution" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PaymentOfFeesRelatedToRevolvingCreditAgreement" id="wso_PaymentOfFeesRelatedToRevolvingCreditAgreement" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfBoardEntitledToElect" id="wso_PercentageOfBoardEntitledToElect" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfOwnershipInterestsAcquired" id="wso_PercentageOfOwnershipInterestsAcquired" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfTaxBasisOfAcquiredGoodwillAmortized" id="wso_PercentageOfTaxBasisOfAcquiredGoodwillAmortized" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfTotalPurchasesFromRelatedParty" id="wso_PercentageOfTotalPurchasesFromRelatedParty" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentOfMarketPriceThatShareBasedCompensationAwardsAreGranted" id="wso_PercentOfMarketPriceThatShareBasedCompensationAwardsAreGranted" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentOfOperationAndInvestmentIncomeForWhichIncomeTaxExpenseAndEffectiveTaxRateCalculated" id="wso_PercentOfOperationAndInvestmentIncomeForWhichIncomeTaxExpenseAndEffectiveTaxRateCalculated" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PerformanceBondsMember" id="wso_PerformanceBondsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PreviousRevolvingCreditFacilityMember" id="wso_PreviousRevolvingCreditFacilityMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ProFormaNetIncomeLossAttributableToNoncontrollingInterest" id="wso_ProFormaNetIncomeLossAttributableToNoncontrollingInterest" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="QuarterlyFinancialDataLineItems" id="wso_QuarterlyFinancialDataLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ReconciliationOfEffectiveIncomeTaxRateLineItems" id="wso_ReconciliationOfEffectiveIncomeTaxRateLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ReconciliationOfEffectiveIncomeTaxRateTable" id="wso_ReconciliationOfEffectiveIncomeTaxRateTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="ReductionInDilutedEarningsPerShareFromPaymentOfSpecialDividend" id="wso_ReductionInDilutedEarningsPerShareFromPaymentOfSpecialDividend" type="num:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ReturnOfCapitalContributionToNoncontrollingInterest" id="wso_ReturnOfCapitalContributionToNoncontrollingInterest" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="Scenario1Member" id="wso_Scenario1Member" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="Scenario2Member" id="wso_Scenario2Member" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfGoodwillAndOtherIntangibleAssetsTable" id="wso_ScheduleOfGoodwillAndOtherIntangibleAssetsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="ScheduleOfIncomeTaxesTable" id="wso_ScheduleOfIncomeTaxesTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="ScheduleOfIntangibleAssetsTable" id="wso_ScheduleOfIntangibleAssetsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="ScheduleOfQuarterlyFinancialDataTable" id="wso_ScheduleOfQuarterlyFinancialDataTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="ScheduleOfUnrecognizedTaxBenefitsTable" id="wso_ScheduleOfUnrecognizedTaxBenefitsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardAveragePricePerShareOfSharesPurchased" id="wso_ShareBasedCompensationArrangementByShareBasedPaymentAwardAveragePricePerShareOfSharesPurchased" type="num:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardsContractualTerm" id="wso_ShareBasedCompensationArrangementByShareBasedPaymentAwardsContractualTerm" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareOfCarryingValueContributedToJointVenture" id="wso_ShareOfCarryingValueContributedToJointVenture" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SharesDeliveredForTaxWithholdingForShareBasedCompensation" id="wso_SharesDeliveredForTaxWithholdingForShareBasedCompensation" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SharesIssuedToAffiliateOfPartyInJointVenture" id="wso_SharesIssuedToAffiliateOfPartyInJointVenture" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SharesOfNonvestedRestrictedStockObligatedToIssueInConnectionWithIncentiveCompensationAgreements" id="wso_SharesOfNonvestedRestrictedStockObligatedToIssueInConnectionWithIncentiveCompensationAgreements" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SignificantAccountingPoliciesLineItems" id="wso_SignificantAccountingPoliciesLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SignificantAccountingPoliciesTable" id="wso_SignificantAccountingPoliciesTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="SpecialCashDividendPerShareCashPaid" id="wso_SpecialCashDividendPerShareCashPaid" type="num:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StockholdersEquityNoteLineItems" id="wso_StockholdersEquityNoteLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StockholdersEquityNoteTable" id="wso_StockholdersEquityNoteTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="StockIssuancesFromExerciseOfStockOptionsAndEmployeeStockPurchasePlanShares" id="wso_StockIssuancesFromExerciseOfStockOptionsAndEmployeeStockPurchasePlanShares" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StockIssuancesFromExerciseOfStockOptionsAndEmployeeStockPurchasePlanValue" id="wso_StockIssuancesFromExerciseOfStockOptionsAndEmployeeStockPurchasePlanValue" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SwinglineSubfacilityMember" id="wso_SwinglineSubfacilityMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TwoThousandOneIncentiveCompensationPlanMember" id="wso_TwoThousandOneIncentiveCompensationPlanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="UncategorizedAbstract" id="wso_UncategorizedAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="UtcCanadaCorporationMember" id="wso_UtcCanadaCorporationMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ValueOfSharesDeliveredForTaxWithholdingForShareBasedCompensation" id="wso_ValueOfSharesDeliveredForTaxWithholdingForShareBasedCompensation" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="VariableInterestEntityMaximumLossExposure" id="wso_VariableInterestEntityMaximumLossExposure" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="VestingAgeOfChiefExecutiveOfficer" id="wso_VestingAgeOfChiefExecutiveOfficer" type="xbrli:integerItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
</schema>
