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      <link:roleType roleURI="http://kirbycorp.com/20211231/taxonomy/role/Acquisitions2018Details" id="Acquisitions2018Details">
        <link:definition>100490 - Disclosure - Acquisitions, 2018 (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://kirbycorp.com/20211231/taxonomy/role/RevenuesDetails" id="RevenuesDetails">
        <link:definition>100500 - Disclosure - Revenues (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://kirbycorp.com/20211231/taxonomy/role/RevenuesRemainingPerformanceObligationDetails" id="RevenuesRemainingPerformanceObligationDetails">
        <link:definition>100510 - Disclosure - Revenues, Remaining Performance Obligation (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://kirbycorp.com/20211231/taxonomy/role/SegmentDataDetails" id="SegmentDataDetails">
        <link:definition>100520 - Disclosure - Segment Data (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://kirbycorp.com/20211231/taxonomy/role/LongtermDebtCarryingValueAndFairValueOfDebtOutstandingDetails" id="LongtermDebtCarryingValueAndFairValueOfDebtOutstandingDetails">
        <link:definition>100530 - Disclosure - Long-Term Debt, Carrying Value and Fair Value of Debt Outstanding (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://kirbycorp.com/20211231/taxonomy/role/LongtermDebtBorrowingsAndPaymentsUnderBankCreditFacilitiesDetails" id="LongtermDebtBorrowingsAndPaymentsUnderBankCreditFacilitiesDetails">
        <link:definition>100540 - Disclosure - Long-Term Debt, Borrowings and Payments under Bank Credit Facilities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://kirbycorp.com/20211231/taxonomy/role/LongtermDebtScheduleOfAggregatePaymentsDueOnLongtermDebtDetails" id="LongtermDebtScheduleOfAggregatePaymentsDueOnLongtermDebtDetails">
        <link:definition>100550 - Disclosure - Long-Term Debt, Schedule of Aggregate Payments Due on The Long-Term Debt (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://kirbycorp.com/20211231/taxonomy/role/LongtermDebtDetails" id="LongtermDebtDetails">
        <link:definition>100560 - Disclosure - Long-Term Debt (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://kirbycorp.com/20211231/taxonomy/role/LeasesFutureMinimumLeasePaymentsUnderOperatingLeasesDetails" id="LeasesFutureMinimumLeasePaymentsUnderOperatingLeasesDetails">
        <link:definition>100570 - Disclosure - Leases, Future Minimum Lease Payments Under Operating Leases (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://kirbycorp.com/20211231/taxonomy/role/LeasesLeaseCostDetails" id="LeasesLeaseCostDetails">
        <link:definition>100580 - Disclosure - Leases, Lease Cost (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://kirbycorp.com/20211231/taxonomy/role/LeasesOtherSupplementalInformationDetails" id="LeasesOtherSupplementalInformationDetails">
        <link:definition>100590 - Disclosure - Leases, Other Supplemental Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://kirbycorp.com/20211231/taxonomy/role/ImpairmentsAndOtherChargesDetails" id="ImpairmentsAndOtherChargesDetails">
        <link:definition>100600 - Disclosure - Impairments and Other Charges (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://kirbycorp.com/20211231/taxonomy/role/StockAwardPlansCompensationCostDetails" id="StockAwardPlansCompensationCostDetails">
        <link:definition>100610 - Disclosure - Stock Award Plans, Compensation Cost (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://kirbycorp.com/20211231/taxonomy/role/StockAwardPlansEmployeePlanStockOptionActivityDetails" id="StockAwardPlansEmployeePlanStockOptionActivityDetails">
        <link:definition>100620 - Disclosure - Stock Award Plans, Employee Plan Stock Option Activity (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://kirbycorp.com/20211231/taxonomy/role/StockAwardPlansEmployeePlanOutstandingAndExercisableOptionsDetails" id="StockAwardPlansEmployeePlanOutstandingAndExercisableOptionsDetails">
        <link:definition>100630 - Disclosure - Stock Award Plans, Employee Plan Outstanding and Exercisable Options (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://kirbycorp.com/20211231/taxonomy/role/StockAwardPlansEmployeePlanRestrictedStockAwardActivityDetails" id="StockAwardPlansEmployeePlanRestrictedStockAwardActivityDetails">
        <link:definition>100640 - Disclosure - Stock Award Plans, Employee Plan Restricted Stock Award Activity (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://kirbycorp.com/20211231/taxonomy/role/StockAwardPlansEmployeePlanRsuActivityDetails" id="StockAwardPlansEmployeePlanRsuActivityDetails">
        <link:definition>100650 - Disclosure - Stock Award Plans, Employee Plan RSU Activity (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://kirbycorp.com/20211231/taxonomy/role/StockAwardPlansDirectorPlanStockOptionActivityDetails" id="StockAwardPlansDirectorPlanStockOptionActivityDetails">
        <link:definition>100660 - Disclosure - Stock Award Plans, Director Plan Stock Option Activity (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://kirbycorp.com/20211231/taxonomy/role/StockAwardPlansDirectorPlanOutstandingAndExercisableOptionsDetails" id="StockAwardPlansDirectorPlanOutstandingAndExercisableOptionsDetails">
        <link:definition>100670 - Disclosure - Stock Award Plans, Director Plan Outstanding and Exercisable Options (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://kirbycorp.com/20211231/taxonomy/role/StockAwardPlansDirectorPlanRestrictedStockAwardActivityDetails" id="StockAwardPlansDirectorPlanRestrictedStockAwardActivityDetails">
        <link:definition>100680 - Disclosure - Stock Award Plans, Director Plan Restricted Stock Award Activity (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://kirbycorp.com/20211231/taxonomy/role/StockAwardPlansAllPlansOptionsAndRestrictedStockAwardActivityDetails" id="StockAwardPlansAllPlansOptionsAndRestrictedStockAwardActivityDetails">
        <link:definition>100690 - Disclosure - Stock Award Plans, All Plans Options and Restricted Stock Award Activity (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://kirbycorp.com/20211231/taxonomy/role/DisclosureTaxesOnIncomeEarningsLossBeforeTaxesDetails" id="DisclosureTaxesOnIncomeEarningsLossBeforeTaxesDetails">
        <link:definition>100700 - Disclosure - Taxes on Income, Earnings (Loss) Before Taxes (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://kirbycorp.com/20211231/taxonomy/role/TaxesOnIncomeScheduleOfEffectiveIncomeTaxRateReconciliationDetails" id="TaxesOnIncomeScheduleOfEffectiveIncomeTaxRateReconciliationDetails">
        <link:definition>100710 - Disclosure - Taxes on Income, Schedule of Effective Income Tax Rate Reconciliation (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://kirbycorp.com/20211231/taxonomy/role/TaxesOnIncomeScheduleOfDeferredTaxAssetsAndLiabilitiesDetails" id="TaxesOnIncomeScheduleOfDeferredTaxAssetsAndLiabilitiesDetails">
        <link:definition>100720 - Disclosure - Taxes on Income, Schedule of Deferred Tax Assets and Liabilities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://kirbycorp.com/20211231/taxonomy/role/TaxesOnIncomeReconciliationOfLiabilityForUnrecognizedTaxBenefitsDetails" id="TaxesOnIncomeReconciliationOfLiabilityForUnrecognizedTaxBenefitsDetails">
        <link:definition>100730 - Disclosure - Taxes on Income, Reconciliation of Liability for Unrecognized Tax Benefits (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://kirbycorp.com/20211231/taxonomy/role/EarningsPerShareDetails" id="EarningsPerShareDetails">
        <link:definition>100740 - Disclosure - Earnings Per Share (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://kirbycorp.com/20211231/taxonomy/role/InventoriesDetails" id="InventoriesDetails">
        <link:definition>100750 - Disclosure - Inventories (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://kirbycorp.com/20211231/taxonomy/role/RetirementPlansInformationAboutPlanAssetsAndAssetAllocationDetails" id="RetirementPlansInformationAboutPlanAssetsAndAssetAllocationDetails">
        <link:definition>100760 - Disclosure - Retirement Plans, Information About Plan Assets and Asset Allocation (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://kirbycorp.com/20211231/taxonomy/role/RetirementPlansScheduleOfChangeInBenefitObligationDetails" id="RetirementPlansScheduleOfChangeInBenefitObligationDetails">
        <link:definition>100770 - Disclosure - Retirement Plans, Schedule of Change in Benefit Obligation (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://kirbycorp.com/20211231/taxonomy/role/RetirementPlansWeightedaverageAssumptionUsedToDetermineBenefitObligationDetails" id="RetirementPlansWeightedaverageAssumptionUsedToDetermineBenefitObligationDetails">
        <link:definition>100780 - Disclosure - Retirement Plans, Weighted-Average Assumption Used to Determine Benefit Obligation (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://kirbycorp.com/20211231/taxonomy/role/RetirementPlansSummaryOfChangeInPlanAssetsDetails" id="RetirementPlansSummaryOfChangeInPlanAssetsDetails">
        <link:definition>100790 - Disclosure - Retirement Plans, Summary of Change in Plan Assets (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://kirbycorp.com/20211231/taxonomy/role/RetirementPlansSummaryOfFundedStatusAtEndOfYearDetails" id="RetirementPlansSummaryOfFundedStatusAtEndOfYearDetails">
        <link:definition>100800 - Disclosure - Retirement Plans, Summary of Funded Status at End of Year (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://kirbycorp.com/20211231/taxonomy/role/RetirementPlansAmountsRecognizedInConsolidatedBalanceSheetsDetails" id="RetirementPlansAmountsRecognizedInConsolidatedBalanceSheetsDetails">
        <link:definition>100810 - Disclosure - Retirement Plans, Amounts Recognized in Consolidated Balance Sheets (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://kirbycorp.com/20211231/taxonomy/role/RetirementPlansAmountsRecognizedInAccumulatedOtherComprehensiveIncomeDetails" id="RetirementPlansAmountsRecognizedInAccumulatedOtherComprehensiveIncomeDetails">
        <link:definition>100820 - Disclosure - Retirement Plans, Amounts Recognized in Accumulated Other Comprehensive Income (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://kirbycorp.com/20211231/taxonomy/role/RetirementPlansExpectedEmployerContributionAndBenefitPaymentsDetails" id="RetirementPlansExpectedEmployerContributionAndBenefitPaymentsDetails">
        <link:definition>100830 - Disclosure - Retirement Plans, Expected Employer Contribution and Benefit Payments (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://kirbycorp.com/20211231/taxonomy/role/RetirementPlansComponentsOfNetPeriodicBenefitCostPensionBenefitsDetails" id="RetirementPlansComponentsOfNetPeriodicBenefitCostPensionBenefitsDetails">
        <link:definition>100840 - Disclosure - Retirement Plans, Components of Net Periodic Benefit Cost, Pension Benefits (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://kirbycorp.com/20211231/taxonomy/role/RetirementPlansWeightedAverageAssumptionsUsedToDetermineNetPeriodicBenefitCostPensionBenefitsDetails" id="RetirementPlansWeightedAverageAssumptionsUsedToDetermineNetPeriodicBenefitCostPensionBenefitsDetails">
        <link:definition>100850 - Disclosure - Retirement Plans, Weighted Average Assumptions Used to Determine Net Periodic Benefit Cost, Pension Benefits (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://kirbycorp.com/20211231/taxonomy/role/RetirementPlansComponentsOfNetPeriodicBenefitCostOtherPostretirementBenefitsDetails" id="RetirementPlansComponentsOfNetPeriodicBenefitCostOtherPostretirementBenefitsDetails">
        <link:definition>100860 - Disclosure - Retirement Plans, Components of Net Periodic Benefit Cost, Other Postretirement Benefits (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://kirbycorp.com/20211231/taxonomy/role/RetirementPlansWeightedAverageAssumptionsUsedToDetermineNetPeriodicBenefitCostOtherPostretirementBenefitsDetails" id="RetirementPlansWeightedAverageAssumptionsUsedToDetermineNetPeriodicBenefitCostOtherPostretirementBenefitsDetails">
        <link:definition>100870 - Disclosure - Retirement Plans, Weighted Average Assumptions Used to Determine Net Periodic Benefit Cost, Other Postretirement Benefits (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://kirbycorp.com/20211231/taxonomy/role/RetirementPlansMultiemployerPensionPlanAndDefinedContributionPlansDetails" id="RetirementPlansMultiemployerPensionPlanAndDefinedContributionPlansDetails">
        <link:definition>100880 - Disclosure - Retirement Plans, Multiemployer Pension Plan and Defined Contribution Plans (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://kirbycorp.com/20211231/taxonomy/role/OtherComprehensiveIncomeLossDetails" id="OtherComprehensiveIncomeLossDetails">
        <link:definition>100890 - Disclosure - Other Comprehensive Income (Loss) (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://kirbycorp.com/20211231/taxonomy/role/ContingenciesAndCommitmentsDetails" id="ContingenciesAndCommitmentsDetails">
        <link:definition>100900 - Disclosure - Contingencies and Commitments (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://kirbycorp.com/20211231/taxonomy/role/ContingenciesAndCommitmentsCertainSignificantRisksAndUncertaintiesDetails" id="ContingenciesAndCommitmentsCertainSignificantRisksAndUncertaintiesDetails">
        <link:definition>100910 - Disclosure - Contingencies and Commitments, Certain Significant Risks and Uncertainties (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://kirbycorp.com/20211231/taxonomy/role/RelatedPartyTransactionsDetails" id="RelatedPartyTransactionsDetails">
        <link:definition>100920 - Disclosure - Related Party Transactions (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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  <xsd:element id="kex_OutstandingAndExercisableStockOptionsAbstract" name="OutstandingAndExercisableStockOptionsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_ProvisionForTaxesOnIncomeAbstract" name="ProvisionForTaxesOnIncomeAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_RelatedPartyAbstract" name="RelatedPartyAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_RestrictedStockAwardActivityAbstract" name="RestrictedStockAwardActivityAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_RestrictedStockUnitActivityAbstract" name="RestrictedStockUnitActivityAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_ShareBasedCompensationPlansCombinedDisclosureAbstract" name="ShareBasedCompensationPlansCombinedDisclosureAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsAbstract" name="ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsAbstract" name="ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_SharesOutstandingAbstract" name="SharesOutstandingAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_AccrualsForRevenuesEarnedIncludedInAccountsReceivable" name="AccrualsForRevenuesEarnedIncludedInAccountsReceivable" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="kex_AmortizationOfMajorMaintenanceActivityCosts" name="AmortizationOfMajorMaintenanceActivityCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="kex_AmortizationOfMajorMaintenanceCosts" name="AmortizationOfMajorMaintenanceCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="kex_AmortizationOfUnearnedCompensation" name="AmortizationOfUnearnedCompensation" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="kex_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccruedLiabilities" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccruedLiabilities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="kex_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseRightOfUseAssets" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseRightOfUseAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="kex_CapitalExpendituresIncurredPaidAndNotYetPaid" name="CapitalExpendituresIncurredPaidAndNotYetPaid" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="kex_CoronavirusAidReliefAndEconomicSecurityActIncomeTaxExpenseBenefit" name="CoronavirusAidReliefAndEconomicSecurityActIncomeTaxExpenseBenefit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="kex_CostsOfSalesAndOperatingExpenses" name="CostsOfSalesAndOperatingExpenses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="kex_CustomerRelationshipPeriod" name="CustomerRelationshipPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="kex_DamagesAndAssessmentCost" name="DamagesAndAssessmentCost" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="kex_DeferredTaxAssetsTaxDeferredExpenseOfNonCurrentUnrealizedLossOnDefinedBenefitPlans" name="DeferredTaxAssetsTaxDeferredExpenseOfNonCurrentUnrealizedLossOnDefinedBenefitPlans" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="kex_DeferredTaxLiabilitiesStateTaxes" name="DeferredTaxLiabilitiesStateTaxes" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="kex_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostInitialHealthCareCostTrendRate" name="DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostInitialHealthCareCostTrendRate" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="kex_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostUltimateHealthCareCostTrendRate" name="DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostUltimateHealthCareCostTrendRate" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="kex_DefinedBenefitPlanInitialHealthCareCostTrendRate" name="DefinedBenefitPlanInitialHealthCareCostTrendRate" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="kex_DefinedBenefitPlanMaximumContributionLimit" name="DefinedBenefitPlanMaximumContributionLimit" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="kex_DefinedBenefitPlanYearHealthCareCostTrendRateUltimateTrendRate" name="DefinedBenefitPlanYearHealthCareCostTrendRateUltimateTrendRate" type="xbrli:gYearItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="kex_DefinedContributionPlanContributionPercentageAggregateAccumulatedBenefitObligation" name="DefinedContributionPlanContributionPercentageAggregateAccumulatedBenefitObligation" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="kex_EffectiveIncomeTaxRateReconciliationCaresActNetOperatingLossCarryback" name="EffectiveIncomeTaxRateReconciliationCaresActNetOperatingLossCarryback" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="kex_EmployeePensionPlanGrandfatheredParticipantsParticipantAge" name="EmployeePensionPlanGrandfatheredParticipantsParticipantAge" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="kex_EmployeePensionPlanGrandfatheredParticipantsParticipantServicePeriodWhoIsFiftyYearsOld" name="EmployeePensionPlanGrandfatheredParticipantsParticipantServicePeriodWhoIsFiftyYearsOld" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="kex_EmployeePensionPlanGrandfatheredParticipantsServicePeriod" name="EmployeePensionPlanGrandfatheredParticipantsServicePeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="kex_FiniteLivedIntangibleAssetsAndLiabilitiesAmortizationExpenseNextTwelveMonths" name="FiniteLivedIntangibleAssetsAndLiabilitiesAmortizationExpenseNextTwelveMonths" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="kex_FiniteLivedIntangibleAssetsAndLiabilitiesAmortizationExpenseYearFive" name="FiniteLivedIntangibleAssetsAndLiabilitiesAmortizationExpenseYearFive" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="kex_FiniteLivedIntangibleAssetsAndLiabilitiesAmortizationExpenseYearFour" name="FiniteLivedIntangibleAssetsAndLiabilitiesAmortizationExpenseYearFour" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="kex_FiniteLivedIntangibleAssetsAndLiabilitiesAmortizationExpenseYearThree" name="FiniteLivedIntangibleAssetsAndLiabilitiesAmortizationExpenseYearThree" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="kex_FiniteLivedIntangibleAssetsAndLiabilitiesAmortizationExpenseYearTwo" name="FiniteLivedIntangibleAssetsAndLiabilitiesAmortizationExpenseYearTwo" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="kex_FiniteLivedIntangibleLiabilitiesAccumulatedAmortization" name="FiniteLivedIntangibleLiabilitiesAccumulatedAmortization" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="kex_FiniteLivedIntangibleLiabilitiesGross" name="FiniteLivedIntangibleLiabilitiesGross" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="kex_FiniteLivedIntangibleLiabilitiesNet" name="FiniteLivedIntangibleLiabilitiesNet" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="kex_GeneralCorporateAssets" name="GeneralCorporateAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="kex_GeneralCorporateExpenses" name="GeneralCorporateExpenses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="kex_InsurancePremiumsAndClaims" name="InsurancePremiumsAndClaims" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="kex_IntangibleAssetsAndLiabilitiesWeightedAverageAmortizationPeriod" name="IntangibleAssetsAndLiabilitiesWeightedAverageAmortizationPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="kex_MarineTransportationEquipment" name="MarineTransportationEquipment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="kex_NumberOfBargeSlips" name="NumberOfBargeSlips" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="kex_NumberOfMajorCustomersAccountingMoreThanTenPercentOfRevenue" name="NumberOfMajorCustomersAccountingMoreThanTenPercentOfRevenue" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="kex_NumberOfMaritimeVessels" name="NumberOfMaritimeVessels" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="kex_NumberOfMaritimeVesselsAcquired" name="NumberOfMaritimeVesselsAcquired" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="kex_NumberOfTopDistributorsOffHighwayEngines" name="NumberOfTopDistributorsOffHighwayEngines" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="kex_NumberOfVesselsDamagedInCollisionResultingInFuelOilDischarge" name="NumberOfVesselsDamagedInCollisionResultingInFuelOilDischarge" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="kex_NumberOfYearsNetOperatingLossesCarriedBack" name="NumberOfYearsNetOperatingLossesCarriedBack" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="kex_OneTimeDeferredTaxProvision" name="OneTimeDeferredTaxProvision" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="kex_OperatingLeaseTerminationExpense" name="OperatingLeaseTerminationExpense" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="kex_OperatingLossCarryforwardsNetOfValuationAllowanceFederal" name="OperatingLossCarryforwardsNetOfValuationAllowanceFederal" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="kex_OtherComprehensiveIncomeLossDefinedBenefitPlanPriorServiceCostCreditSettlementReclassificationAdjustmentFromAOCIAfterTax" name="OtherComprehensiveIncomeLossDefinedBenefitPlanPriorServiceCostCreditSettlementReclassificationAdjustmentFromAOCIAfterTax" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="kex_OtherComprehensiveIncomeLossDefinedBenefitPlanPriorServiceCostCreditSettlementReclassificationAdjustmentFromAOCIBeforeTax" name="OtherComprehensiveIncomeLossDefinedBenefitPlanPriorServiceCostCreditSettlementReclassificationAdjustmentFromAOCIBeforeTax" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="kex_OtherComprehensiveIncomeLossDefinedBenefitPlanPriorServiceCostCreditSettlementReclassificationAdjustmentFromAOCITax" name="OtherComprehensiveIncomeLossDefinedBenefitPlanPriorServiceCostCreditSettlementReclassificationAdjustmentFromAOCITax" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="kex_PensionPlanDefinedBenefitPlanCostIncreaseLimitPercentage" name="PensionPlanDefinedBenefitPlanCostIncreaseLimitPercentage" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="kex_PercentageOfCoastalRevenue" name="PercentageOfCoastalRevenue" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="kex_PercentageOfCostsRelatedToServiceCostsEstimated" name="PercentageOfCostsRelatedToServiceCostsEstimated" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="kex_PercentageOfInlandRevenue" name="PercentageOfInlandRevenue" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="kex_PeriodInWhichRecertificationOfOceanGoingVesselsOccurTwice" name="PeriodInWhichRecertificationOfOceanGoingVesselsOccurTwice" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="kex_PeriodOfAmortizationOfShipyardCosts" name="PeriodOfAmortizationOfShipyardCosts" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="kex_PropertyPlantAndEquipmentAverageAge" name="PropertyPlantAndEquipmentAverageAge" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="kex_RangeOfRenewalOptionsUnderTermContracts" name="RangeOfRenewalOptionsUnderTermContracts" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="kex_ReceivablesFromInsuranceCompaniesToCoverClaimsInExcessIncludedInAccountsReceivable" name="ReceivablesFromInsuranceCompaniesToCoverClaimsInExcessIncludedInAccountsReceivable" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="kex_ReturnOfInvestmentToNoncontrollingInterests" name="ReturnOfInvestmentToNoncontrollingInterests" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="kex_RevenueDerivedFromTermContractsMaturityPeriod" name="RevenueDerivedFromTermContractsMaturityPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="kex_ServicesSegmentsRelationshipYears" name="ServicesSegmentsRelationshipYears" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="kex_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodFairValue" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodFairValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="kex_SiteContingencyNumberOfCompaniesNamedAsPotentiallyResponsiblePartiesUnderComprehensiveEnvironmentalResponseCompensationAndLiabilityAct" name="SiteContingencyNumberOfCompaniesNamedAsPotentiallyResponsiblePartiesUnderComprehensiveEnvironmentalResponseCompensationAndLiabilityAct" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="kex_SiteContingencyNumberOfSpills" name="SiteContingencyNumberOfSpills" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="kex_TankBargeAggregateBarrelCapacity" name="TankBargeAggregateBarrelCapacity" type="xbrli:decimalItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="kex_TankBargeBarrelCapacity" name="TankBargeBarrelCapacity" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="kex_TaxBenefitFromRestrictedStockVesting" name="TaxBenefitFromRestrictedStockVesting" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="kex_TaxCutsAndJobsActOtherComprehensiveIncomeLossReclassificationFromAociToRetainedEarningsBeforeTax" name="TaxCutsAndJobsActOtherComprehensiveIncomeLossReclassificationFromAociToRetainedEarningsBeforeTax" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="kex_TaxCutsAndJobsActOtherComprehensiveIncomeLossReclassificationFromAociToRetainedEarningsNetOfTax" name="TaxCutsAndJobsActOtherComprehensiveIncomeLossReclassificationFromAociToRetainedEarningsNetOfTax" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="kex_TermOfInstrumentUnderGuarantorObligations" name="TermOfInstrumentUnderGuarantorObligations" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="kex_UndistributedEarningsReallocatedToRestrictedShares" name="UndistributedEarningsReallocatedToRestrictedShares" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="kex_UnrecognizedTaxBenefitsIncludingIncomeTaxPenaltiesAndInterest" name="UnrecognizedTaxBenefitsIncludingIncomeTaxPenaltiesAndInterest" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="kex_WeightedAverageCommonStockIssuedAndOutstanding" name="WeightedAverageCommonStockIssuedAndOutstanding" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="kex_WeightedAverageUsefulLifeUnfavorableContracts" name="WeightedAverageUsefulLifeUnfavorableContracts" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="kex_IncomeTaxDisclosureLineItems" name="IncomeTaxDisclosureLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_SignificantAccountingPoliciesLineItems" name="SignificantAccountingPoliciesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_AmericanBureauOfShippingMember" name="AmericanBureauOfShippingMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_BankNotePayableMember" name="BankNotePayableMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_BarrelTankBargesMember" name="BarrelTankBargesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_CashAndEquitySecuritiesMember" name="CashAndEquitySecuritiesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_CenacMarineServicesLlcMember" name="CenacMarineServicesLlcMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_CentralPensionFundOfTheInternationalUnionOfOperatingMember" name="CentralPensionFundOfTheInternationalUnionOfOperatingMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_CoastalTransportationMember" name="CoastalTransportationMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_CommercialAndIndustrialMember" name="CommercialAndIndustrialMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_ConvoyServicingCompanyAndAgilityFleetServicesLLCMember" name="ConvoyServicingCompanyAndAgilityFleetServicesLLCMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_DirectorPlanMember" name="DirectorPlanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_DistributionAndServicesMember" name="DistributionAndServicesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_EmployeePlanMember" name="EmployeePlanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_EnergyStorageSystemMember" name="EnergyStorageSystemMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_FirstPriceRangeMember" name="FirstPriceRangeMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_FourthPriceRangeMember" name="FourthPriceRangeMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_HigmanMarineIncMember" name="HigmanMarineIncMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_InlandPressureTankBargesMember" name="InlandPressureTankBargesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_InlandTankBargesMember" name="InlandTankBargesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_InlandTowboatsMember" name="InlandTowboatsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_InlandTransportationMember" name="InlandTransportationMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_LimitedLiabilityPartnershipMember" name="LimitedLiabilityPartnershipMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_MarineTransportationEquipmentMember" name="MarineTransportationEquipmentMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_MarineTransportationMember" name="MarineTransportationMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_MarineTransportationSegmentMember" name="MarineTransportationSegmentMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_Plan2018Member" name="Plan2018Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_Plan2019And2017Member" name="Plan2019And2017Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_Plan2019Member" name="Plan2019Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_Plan2020Member" name="Plan2020Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_PortlandHarborSuperfundSiteMember" name="PortlandHarborSuperfundSiteMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_PressureTankBargesMember" name="PressureTankBargesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_RevolvingCreditFacilityDueJuneThirtyTwoThousandTwentyOneMember" name="RevolvingCreditFacilityDueJuneThirtyTwoThousandTwentyOneMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_SavageInlandMarineLLCAndConvoyServicingCompanyAndAgilityFleetServicesLLCMember" name="SavageInlandMarineLLCAndConvoyServicingCompanyAndAgilityFleetServicesLLCMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_SavageInlandMarineLLCMember" name="SavageInlandMarineLLCMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_SBAShipyardSiteMember" name="SBAShipyardSiteMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_SeafarersPensionTrustMember" name="SeafarersPensionTrustMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_SecondPriceRangeMember" name="SecondPriceRangeMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_SeniorNotesDueMarchOneTwoThousandTwentyEightMember" name="SeniorNotesDueMarchOneTwoThousandTwentyEightMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_SeniorNotesSeriesBDueFebruaryTwentySevenTwoThousandTwentyThreeMember" name="SeniorNotesSeriesBDueFebruaryTwentySevenTwoThousandTwentyThreeMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_SeniorNotesSeriesDueFebruaryTwentySevenTwoThousandTwentyMember" name="SeniorNotesSeriesDueFebruaryTwentySevenTwoThousandTwentyMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_SettlementAgreementMember" name="SettlementAgreementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_SignalMutualIndemnityAssociationLtdMember" name="SignalMutualIndemnityAssociationLtdMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_StockAndIncentivePlan2005Member" name="StockAndIncentivePlan2005Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_TargaResourcesCorporationMember" name="TargaResourcesCorporationMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_TermLoanFacilityMember" name="TermLoanFacilityMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_ThirdPriceRangeMember" name="ThirdPriceRangeMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_ThreePointFiveOneSeriesBNotesDueJanuaryNineteenTwoThousandThirtyThreeMember" name="ThreePointFiveOneSeriesBNotesDueJanuaryNineteenTwoThousandThirtyThreeMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_ThreePointFourSixSeriesANotesDueJanuaryNineteenTwoThousandThirtyThreeMember" name="ThreePointFourSixSeriesANotesDueJanuaryNineteenTwoThousandThirtyThreeMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_TotalExercisePriceRangeMember" name="TotalExercisePriceRangeMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_TugboatsMember" name="TugboatsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_UKProtectionIndemnityAssociationMember" name="UKProtectionIndemnityAssociationMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_UnassertedClaim1Member" name="UnassertedClaim1Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_IncomeTaxDisclosureTable" name="IncomeTaxDisclosureTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_SignificantAccountingPoliciesTable" name="SignificantAccountingPoliciesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="kex_OperatingLeasesWeightedAverageDiscountRateAndRemainingLeaseTermTableTextBlock" name="OperatingLeasesWeightedAverageDiscountRateAndRemainingLeaseTermTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="kex_ScheduleOfOtherSegmentReportingInformationBySegmentTableTextBlock" name="ScheduleOfOtherSegmentReportingInformationBySegmentTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="kex_DryDockingRequirementsPolicyTextBlock" name="DryDockingRequirementsPolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="kex_FiniteLivedIntangibleAssetsAndLiabilitiesTableTextBlock" name="FiniteLivedIntangibleAssetsAndLiabilitiesTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="kex_ScheduleOfExpectedCashFlowsTableTextBlock" name="ScheduleOfExpectedCashFlowsTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
</xsd:schema>
