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    <link:label id="lab_us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest_4E0F0132D20350FDF5D74599D07DCF1D_terseLabel_en-US" xlink:label="lab_us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest_4E0F0132D20350FDF5D74599D07DCF1D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net income attributable to redeemable NCI</link:label>
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    <link:label id="lab_mck_ReclassificationtoTemporaryEquity_D0817712D94646175FDE4599D07DEB9E_label_en-US" xlink:label="lab_mck_ReclassificationtoTemporaryEquity_D0817712D94646175FDE4599D07DEB9E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Reclassification to Temporary Equity</link:label>
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    <link:label id="lab_mck_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParentConsiderationPaid_3B1CC2994E5D591F90684599D07D0B6E_verboseLabel_en-US" xlink:label="lab_mck_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParentConsiderationPaid_3B1CC2994E5D591F90684599D07D0B6E" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">RNCI shares acquired, cash paid</link:label>
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    <link:label id="lab_us-gaap_RedeemableNoncontrollingInterestEquityCommonCarryingAmount_9C58BD58CB8AB9E99FBC4599D07EAFC5_terseLabel_en-US" xlink:label="lab_us-gaap_RedeemableNoncontrollingInterestEquityCommonCarryingAmount_9C58BD58CB8AB9E99FBC4599D07EAFC5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Redeemable Noncontrolling Interests</link:label>
    <link:label id="lab_us-gaap_RedeemableNoncontrollingInterestEquityCommonCarryingAmount_9C58BD58CB8AB9E99FBC4599D07EAFC5_label_en-US" xlink:label="lab_us-gaap_RedeemableNoncontrollingInterestEquityCommonCarryingAmount_9C58BD58CB8AB9E99FBC4599D07EAFC5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_RedeemableNoncontrollingInterestEquityCommonCarryingAmount" xlink:label="loc_us-gaap_RedeemableNoncontrollingInterestEquityCommonCarryingAmount_9C58BD58CB8AB9E99FBC4599D07EAFC5" xlink:type="locator" />
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    <link:label id="lab_mck_RedeemableNoncontrollingInterestsMaximumRedemptionValue_BD422F657617E11F7DB84599D07EA687_documentation_en-US" xlink:label="lab_mck_RedeemableNoncontrollingInterestsMaximumRedemptionValue_BD422F657617E11F7DB84599D07EA687" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Maximum redemption value of redeemable noncontrolling interests</link:label>
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    <link:label id="lab_mck_RecurringCompensationtoRedeemableNoncontrollingInterests_67F434C7A911F56A82674599D07E86FF_terseLabel_en-US" xlink:label="lab_mck_RecurringCompensationtoRedeemableNoncontrollingInterests_67F434C7A911F56A82674599D07E86FF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Recurring compensation to redeemable NCI</link:label>
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    <link:loc xlink:href="mck-20150331.xsd#mck_RecurringCompensationtoRedeemableNoncontrollingInterests" xlink:label="loc_mck_RecurringCompensationtoRedeemableNoncontrollingInterests_67F434C7A911F56A82674599D07E86FF" xlink:type="locator" />
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    <link:label id="lab_us-gaap_MinorityInterestOwnershipPercentageByParent_8380C8BF180C883393FF4599D07E3ACA_verboseLabel_en-US" xlink:label="lab_us-gaap_MinorityInterestOwnershipPercentageByParent_8380C8BF180C883393FF4599D07E3ACA" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">RNCI ownership interest, parent</link:label>
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    <link:label id="lab_us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationGainLossArisingDuringPeriodTax_C8A0E083ADDB671040A145017D9BE8C4_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationGainLossArisingDuringPeriodTax_C8A0E083ADDB671040A145017D9BE8C4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income (Loss), Foreign Currency Translation Gain (Loss) Arising During Period, Tax</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationGainLossArisingDuringPeriodTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationGainLossArisingDuringPeriodTax_C8A0E083ADDB671040A145017D9BE8C4" xlink:type="locator" />
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    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationTax_67AEA9E654434C7F03B245017D9B6223_terseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationTax_67AEA9E654434C7F03B245017D9B6223" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Reclassified to income statement, income tax expense of nil, $24 and nil</link:label>
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationTax_67AEA9E654434C7F03B245017D9B6223_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationTax_67AEA9E654434C7F03B245017D9B6223" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Tax</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationTax_67AEA9E654434C7F03B245017D9B6223" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationTax_67AEA9E654434C7F03B245017D9B6223" xlink:to="lab_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationTax_67AEA9E654434C7F03B245017D9B6223" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax_6BEA8B144872F8C8907545017D9B24A9_terseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax_6BEA8B144872F8C8907545017D9B24A9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unrealized losses on cash flow hedges arising during period, tax benefit of nil, nil and nil</link:label>
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax_6BEA8B144872F8C8907545017D9B24A9_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax_6BEA8B144872F8C8907545017D9B24A9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax_6BEA8B144872F8C8907545017D9B24A9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax_6BEA8B144872F8C8907545017D9B24A9" xlink:to="lab_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax_6BEA8B144872F8C8907545017D9B24A9" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax_34BB3F253F6CEB1C94EF45017D9B493F_terseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax_34BB3F253F6CEB1C94EF45017D9B493F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Reclassification to income statement, net of income tax expense of nil, nil and nil</link:label>
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax_34BB3F253F6CEB1C94EF45017D9B493F_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax_34BB3F253F6CEB1C94EF45017D9B493F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax_34BB3F253F6CEB1C94EF45017D9B493F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax_34BB3F253F6CEB1C94EF45017D9B493F" xlink:to="lab_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax_34BB3F253F6CEB1C94EF45017D9B493F" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax_029056DDAA7AF55F4F6445017D9B3B60_terseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax_029056DDAA7AF55F4F6445017D9B3B60" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net actuarial gain (loss) arising during period, net of income tax (benefit) of ($66), $16 and ($22)</link:label>
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax_029056DDAA7AF55F4F6445017D9B3B60_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax_029056DDAA7AF55F4F6445017D9B3B60" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Tax</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax_029056DDAA7AF55F4F6445017D9B3B60" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax_029056DDAA7AF55F4F6445017D9B3B60" xlink:to="lab_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax_029056DDAA7AF55F4F6445017D9B3B60" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax_D7741815E9B107E6750845017D9BB6AE_terseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax_D7741815E9B107E6750845017D9BB6AE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amortization of actuarial loss, prior service cost and transition obligation, net of income tax (benefit) of $6, $12 and $12</link:label>
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax_D7741815E9B107E6750845017D9BB6AE_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax_D7741815E9B107E6750845017D9BB6AE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), Tax</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax_D7741815E9B107E6750845017D9BB6AE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax_D7741815E9B107E6750845017D9BB6AE" xlink:to="lab_us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax_D7741815E9B107E6750845017D9BB6AE" xlink:type="arc" />
    <link:label id="lab_mck_OtherComprehensiveIncomeTranslationImpactOnPensionPlansTax_4EF277D538422B14BCED45017D9C1FA4_terseLabel_en-US" xlink:label="lab_mck_OtherComprehensiveIncomeTranslationImpactOnPensionPlansTax_4EF277D538422B14BCED45017D9C1FA4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Foreign currency translation adjustments, net of income tax expense of nil, nil and nil</link:label>
    <link:label id="lab_mck_OtherComprehensiveIncomeTranslationImpactOnPensionPlansTax_4EF277D538422B14BCED45017D9C1FA4_label_en-US" xlink:label="lab_mck_OtherComprehensiveIncomeTranslationImpactOnPensionPlansTax_4EF277D538422B14BCED45017D9C1FA4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income Translation Impact On Pension Plans, Tax</link:label>
    <link:label id="lab_mck_OtherComprehensiveIncomeTranslationImpactOnPensionPlansTax_4EF277D538422B14BCED45017D9C1FA4_documentation_en-US" xlink:label="lab_mck_OtherComprehensiveIncomeTranslationImpactOnPensionPlansTax_4EF277D538422B14BCED45017D9C1FA4" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income Translation Impact On Pension Plans, Tax</link:label>
    <link:loc xlink:href="mck-20150331.xsd#mck_OtherComprehensiveIncomeTranslationImpactOnPensionPlansTax" xlink:label="loc_mck_OtherComprehensiveIncomeTranslationImpactOnPensionPlansTax_4EF277D538422B14BCED45017D9C1FA4" xlink:type="locator" />
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    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetTransitionAssetObligationTax_C6929B3C41F239C488E745017D9C5C4C_terseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetTransitionAssetObligationTax_C6929B3C41F239C488E745017D9C5C4C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Reclassified to income statement, income tax expense of nil, $1 and nil</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetTransitionAssetObligationTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetTransitionAssetObligationTax_C6929B3C41F239C488E745017D9C5C4C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetTransitionAssetObligationTax_C6929B3C41F239C488E745017D9C5C4C" xlink:to="lab_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetTransitionAssetObligationTax_C6929B3C41F239C488E745017D9C5C4C" xlink:type="arc" />
    <link:label id="lab_mck_AccountsReceivableCustomerAccountsGross_CB5BE7F7CC14CBE49FBFDD66F5793BC6_terseLabel_en-US" xlink:label="lab_mck_AccountsReceivableCustomerAccountsGross_CB5BE7F7CC14CBE49FBFDD66F5793BC6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Customer accounts</link:label>
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    <link:label id="lab_mck_AccountsReceivableCustomerAccountsGross_CB5BE7F7CC14CBE49FBFDD66F5793BC6_documentation_en-US" xlink:label="lab_mck_AccountsReceivableCustomerAccountsGross_CB5BE7F7CC14CBE49FBFDD66F5793BC6" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Accounts Receivable, Customer Accounts, Gross</link:label>
    <link:loc xlink:href="mck-20150331.xsd#mck_AccountsReceivableCustomerAccountsGross" xlink:label="loc_mck_AccountsReceivableCustomerAccountsGross_CB5BE7F7CC14CBE49FBFDD66F5793BC6" xlink:type="locator" />
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    <link:label id="lab_us-gaap_AccountsReceivableGrossCurrent_69EC03210C9661D56A1DDD66F5798784_totalLabel_en-US" xlink:label="lab_us-gaap_AccountsReceivableGrossCurrent_69EC03210C9661D56A1DDD66F5798784" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total</link:label>
    <link:label id="lab_us-gaap_AccountsReceivableGrossCurrent_69EC03210C9661D56A1DDD66F5798784_label_en-US" xlink:label="lab_us-gaap_AccountsReceivableGrossCurrent_69EC03210C9661D56A1DDD66F5798784" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accounts Receivable, Gross, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AccountsReceivableGrossCurrent" xlink:label="loc_us-gaap_AccountsReceivableGrossCurrent_69EC03210C9661D56A1DDD66F5798784" xlink:type="locator" />
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    <link:label id="lab_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_48EC1C2440F718A493BBDD66F579EA82_label_en-US" xlink:label="lab_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_48EC1C2440F718A493BBDD66F579EA82" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Allowance for Doubtful Accounts Receivable, Current</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShippingAndHandlingCostPolicyTextBlock" xlink:label="loc_us-gaap_ShippingAndHandlingCostPolicyTextBlock_7A92144395C8FE9706584498AABB3B15" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_A10A49754D5E64AAA3954498AABB070D_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_A10A49754D5E64AAA3954498AABB070D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment</link:label>
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_A10A49754D5E64AAA3954498AABB070D_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_A10A49754D5E64AAA3954498AABB070D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment, Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PropertyPlantAndEquipmentPolicyTextBlock" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_A10A49754D5E64AAA3954498AABB070D" xlink:type="locator" />
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    <link:label id="lab_us-gaap_GoodwillAndIntangibleAssetsGoodwillPolicy_29DE707968212230EDC04498AABBF407_terseLabel_en-US" xlink:label="lab_us-gaap_GoodwillAndIntangibleAssetsGoodwillPolicy_29DE707968212230EDC04498AABBF407" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Goodwill</link:label>
    <link:label id="lab_us-gaap_GoodwillAndIntangibleAssetsGoodwillPolicy_29DE707968212230EDC04498AABBF407_label_en-US" xlink:label="lab_us-gaap_GoodwillAndIntangibleAssetsGoodwillPolicy_29DE707968212230EDC04498AABBF407" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_GoodwillAndIntangibleAssetsGoodwillPolicy" xlink:label="loc_us-gaap_GoodwillAndIntangibleAssetsGoodwillPolicy_29DE707968212230EDC04498AABBF407" xlink:type="locator" />
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    <link:label id="lab_us-gaap_IntangibleAssetsFiniteLivedPolicy_2E110155E834EFC971684498AABBDA71_terseLabel_en-US" xlink:label="lab_us-gaap_IntangibleAssetsFiniteLivedPolicy_2E110155E834EFC971684498AABBDA71" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Intangible Assets</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_IntangibleAssetsFiniteLivedPolicy" xlink:label="loc_us-gaap_IntangibleAssetsFiniteLivedPolicy_2E110155E834EFC971684498AABBDA71" xlink:type="locator" />
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    <link:label id="lab_us-gaap_SoftwareToBeSoldLeasedOrOtherwiseMarketedPolicy_1DA66258720376ED82C24498AABBF989_terseLabel_en-US" xlink:label="lab_us-gaap_SoftwareToBeSoldLeasedOrOtherwiseMarketedPolicy_1DA66258720376ED82C24498AABBF989" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Capitalized Software Held for Sale</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SoftwareToBeSoldLeasedOrOtherwiseMarketedPolicy" xlink:label="loc_us-gaap_SoftwareToBeSoldLeasedOrOtherwiseMarketedPolicy_1DA66258720376ED82C24498AABBF989" xlink:type="locator" />
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    <link:label id="lab_mck_InsuranceProgramsPolicyTextBlock_9E6E2168289BE36999944498AABB07F2_terseLabel_en-US" xlink:label="lab_mck_InsuranceProgramsPolicyTextBlock_9E6E2168289BE36999944498AABB07F2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Insurance Programs</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_RevenueRecognitionPolicyTextBlock" xlink:label="loc_us-gaap_RevenueRecognitionPolicyTextBlock_3931A7C5B0BD351E10D24498AABBE5C1" xlink:type="locator" />
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    <link:label id="lab_us-gaap_CostOfSalesVendorAllowancesPolicy_1E8080C0DDDBA4687D1E4498AABBFF33_terseLabel_en-US" xlink:label="lab_us-gaap_CostOfSalesVendorAllowancesPolicy_1E8080C0DDDBA4687D1E4498AABBFF33" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Supplier Incentives</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CostOfSalesVendorAllowancesPolicy" xlink:label="loc_us-gaap_CostOfSalesVendorAllowancesPolicy_1E8080C0DDDBA4687D1E4498AABBFF33" xlink:type="locator" />
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    <link:label id="lab_mck_SupplierReservesPolicyTextBlock_9D83394B889030E0A7624498AABB397C_terseLabel_en-US" xlink:label="lab_mck_SupplierReservesPolicyTextBlock_9D83394B889030E0A7624498AABB397C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Supplier Reserves</link:label>
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    <link:loc xlink:href="mck-20150331.xsd#mck_SupplierReservesPolicyTextBlock" xlink:label="loc_mck_SupplierReservesPolicyTextBlock_9D83394B889030E0A7624498AABB397C" xlink:type="locator" />
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    <link:label id="lab_us-gaap_IncomeTaxPolicyTextBlock_12DF5559FE0590D5CABC4498AABB075C_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxPolicyTextBlock_12DF5559FE0590D5CABC4498AABB075C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Income Taxes</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_IncomeTaxPolicyTextBlock" xlink:label="loc_us-gaap_IncomeTaxPolicyTextBlock_12DF5559FE0590D5CABC4498AABB075C" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock_26C413FD7460E0AA2FF74498AABBABAA_terseLabel_en-US" xlink:label="lab_us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock_26C413FD7460E0AA2FF74498AABBABAA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Foreign Currency Translation</link:label>
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    <link:label id="lab_us-gaap_ComprehensiveIncomePolicyPolicyTextBlock_36CBEB8582DFEC3B9B0B4498AABBFD1F_terseLabel_en-US" xlink:label="lab_us-gaap_ComprehensiveIncomePolicyPolicyTextBlock_36CBEB8582DFEC3B9B0B4498AABBFD1F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Comprehensive Income</link:label>
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    <link:label id="lab_mck_OnePointFourZeroPercentNotesDueMarchFifteenthTwoThousandEighteenMember_2E0CC349EFFADC06E661462B7B1B97E2_terseLabel_en-US" xlink:label="lab_mck_OnePointFourZeroPercentNotesDueMarchFifteenthTwoThousandEighteenMember_2E0CC349EFFADC06E661462B7B1B97E2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">1.40% Notes Due March 15, 2018 [Member]</link:label>
    <link:label id="lab_mck_OnePointFourZeroPercentNotesDueMarchFifteenthTwoThousandEighteenMember_2E0CC349EFFADC06E661462B7B1B97E2_label_en-US" xlink:label="lab_mck_OnePointFourZeroPercentNotesDueMarchFifteenthTwoThousandEighteenMember_2E0CC349EFFADC06E661462B7B1B97E2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Point Four Zero Percent Notes Due March Fifteenth Two Thousand Eighteen [Member]</link:label>
    <link:label id="lab_mck_OnePointFourZeroPercentNotesDueMarchFifteenthTwoThousandEighteenMember_2E0CC349EFFADC06E661462B7B1B97E2_documentation_en-US" xlink:label="lab_mck_OnePointFourZeroPercentNotesDueMarchFifteenthTwoThousandEighteenMember_2E0CC349EFFADC06E661462B7B1B97E2" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One Point Four Zero Percent Notes Due March Fifteenth Two Thousand Eighteen [Member]</link:label>
    <link:loc xlink:href="mck-20150331.xsd#mck_OnePointFourZeroPercentNotesDueMarchFifteenthTwoThousandEighteenMember" xlink:label="loc_mck_OnePointFourZeroPercentNotesDueMarchFifteenthTwoThousandEighteenMember_2E0CC349EFFADC06E661462B7B1B97E2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mck_OnePointFourZeroPercentNotesDueMarchFifteenthTwoThousandEighteenMember_2E0CC349EFFADC06E661462B7B1B97E2" xlink:to="lab_mck_OnePointFourZeroPercentNotesDueMarchFifteenthTwoThousandEighteenMember_2E0CC349EFFADC06E661462B7B1B97E2" xlink:type="arc" />
    <link:label id="lab_mck_SevenPointFiveZeroPercentNotesDueFebruaryFifteenTwoThousandNineteenMember_808BD8A184FDB4B731D8462B7B1C88BF_terseLabel_en-US" xlink:label="lab_mck_SevenPointFiveZeroPercentNotesDueFebruaryFifteenTwoThousandNineteenMember_808BD8A184FDB4B731D8462B7B1C88BF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">7.50% Notes Due February 15, 2019 [Member]</link:label>
    <link:label id="lab_mck_SevenPointFiveZeroPercentNotesDueFebruaryFifteenTwoThousandNineteenMember_808BD8A184FDB4B731D8462B7B1C88BF_label_en-US" xlink:label="lab_mck_SevenPointFiveZeroPercentNotesDueFebruaryFifteenTwoThousandNineteenMember_808BD8A184FDB4B731D8462B7B1C88BF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Seven Point Five Zero Percent Notes Due February Fifteen Two Thousand Nineteen [Member]</link:label>
    <link:label id="lab_mck_SevenPointFiveZeroPercentNotesDueFebruaryFifteenTwoThousandNineteenMember_808BD8A184FDB4B731D8462B7B1C88BF_documentation_en-US" xlink:label="lab_mck_SevenPointFiveZeroPercentNotesDueFebruaryFifteenTwoThousandNineteenMember_808BD8A184FDB4B731D8462B7B1C88BF" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Seven Point Five Zero Percent Notes Due February Fifteen Two Thousand Nineteen [Member]</link:label>
    <link:loc xlink:href="mck-20150331.xsd#mck_SevenPointFiveZeroPercentNotesDueFebruaryFifteenTwoThousandNineteenMember" xlink:label="loc_mck_SevenPointFiveZeroPercentNotesDueFebruaryFifteenTwoThousandNineteenMember_808BD8A184FDB4B731D8462B7B1C88BF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mck_SevenPointFiveZeroPercentNotesDueFebruaryFifteenTwoThousandNineteenMember_808BD8A184FDB4B731D8462B7B1C88BF" xlink:to="lab_mck_SevenPointFiveZeroPercentNotesDueFebruaryFifteenTwoThousandNineteenMember_808BD8A184FDB4B731D8462B7B1C88BF" xlink:type="arc" />
    <link:label id="lab_mck_TwoPointTwoEightNotesDueMarchFifteenthTwoThousandNineteenMember_798C1AA742A8DB8CA6EB462B7B1D7ADF_terseLabel_en-US" xlink:label="lab_mck_TwoPointTwoEightNotesDueMarchFifteenthTwoThousandNineteenMember_798C1AA742A8DB8CA6EB462B7B1D7ADF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2.28% Notes Due March 15, 2019 [Member]</link:label>
    <link:label id="lab_mck_TwoPointTwoEightNotesDueMarchFifteenthTwoThousandNineteenMember_798C1AA742A8DB8CA6EB462B7B1D7ADF_label_en-US" xlink:label="lab_mck_TwoPointTwoEightNotesDueMarchFifteenthTwoThousandNineteenMember_798C1AA742A8DB8CA6EB462B7B1D7ADF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Point Two Eight Notes Due March Fifteenth Two Thousand Nineteen [Member]</link:label>
    <link:label id="lab_mck_TwoPointTwoEightNotesDueMarchFifteenthTwoThousandNineteenMember_798C1AA742A8DB8CA6EB462B7B1D7ADF_documentation_en-US" xlink:label="lab_mck_TwoPointTwoEightNotesDueMarchFifteenthTwoThousandNineteenMember_798C1AA742A8DB8CA6EB462B7B1D7ADF" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Point Two Eight Notes Due March Fifteenth Two Thousand Nineteen [Member]</link:label>
    <link:loc xlink:href="mck-20150331.xsd#mck_TwoPointTwoEightNotesDueMarchFifteenthTwoThousandNineteenMember" xlink:label="loc_mck_TwoPointTwoEightNotesDueMarchFifteenthTwoThousandNineteenMember_798C1AA742A8DB8CA6EB462B7B1D7ADF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mck_TwoPointTwoEightNotesDueMarchFifteenthTwoThousandNineteenMember_798C1AA742A8DB8CA6EB462B7B1D7ADF" xlink:to="lab_mck_TwoPointTwoEightNotesDueMarchFifteenthTwoThousandNineteenMember_798C1AA742A8DB8CA6EB462B7B1D7ADF" xlink:type="arc" />
    <link:label id="lab_mck_FourPointSevenFivePercentNotesDuesMarchOneTwoThousandTwentyOneMember_DF1224DFA741BE297932462B7B1D31A2_terseLabel_en-US" xlink:label="lab_mck_FourPointSevenFivePercentNotesDuesMarchOneTwoThousandTwentyOneMember_DF1224DFA741BE297932462B7B1D31A2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4.75% Notes Due March 1, 2021 [Member]</link:label>
    <link:label id="lab_mck_FourPointSevenFivePercentNotesDuesMarchOneTwoThousandTwentyOneMember_DF1224DFA741BE297932462B7B1D31A2_label_en-US" xlink:label="lab_mck_FourPointSevenFivePercentNotesDuesMarchOneTwoThousandTwentyOneMember_DF1224DFA741BE297932462B7B1D31A2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four Point Seven Five Percent Notes Dues March One Two Thousand Twenty One [Member]</link:label>
    <link:label id="lab_mck_FourPointSevenFivePercentNotesDuesMarchOneTwoThousandTwentyOneMember_DF1224DFA741BE297932462B7B1D31A2_documentation_en-US" xlink:label="lab_mck_FourPointSevenFivePercentNotesDuesMarchOneTwoThousandTwentyOneMember_DF1224DFA741BE297932462B7B1D31A2" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four Point Seven Five Percent Notes Dues March One Two Thousand Twenty One [Member]</link:label>
    <link:loc xlink:href="mck-20150331.xsd#mck_FourPointSevenFivePercentNotesDuesMarchOneTwoThousandTwentyOneMember" xlink:label="loc_mck_FourPointSevenFivePercentNotesDuesMarchOneTwoThousandTwentyOneMember_DF1224DFA741BE297932462B7B1D31A2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mck_FourPointSevenFivePercentNotesDuesMarchOneTwoThousandTwentyOneMember_DF1224DFA741BE297932462B7B1D31A2" xlink:to="lab_mck_FourPointSevenFivePercentNotesDuesMarchOneTwoThousandTwentyOneMember_DF1224DFA741BE297932462B7B1D31A2" xlink:type="arc" />
    <link:label id="lab_mck_TwoPointSevenZeroPercentNotesDueDecemberFifteenTwoThousandTwentyTwoMember_1145179B82A810D5683F462B7B1DA69E_terseLabel_en-US" xlink:label="lab_mck_TwoPointSevenZeroPercentNotesDueDecemberFifteenTwoThousandTwentyTwoMember_1145179B82A810D5683F462B7B1DA69E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2.70% Notes Due December 15, 2022 [Member]</link:label>
    <link:label id="lab_mck_TwoPointSevenZeroPercentNotesDueDecemberFifteenTwoThousandTwentyTwoMember_1145179B82A810D5683F462B7B1DA69E_label_en-US" xlink:label="lab_mck_TwoPointSevenZeroPercentNotesDueDecemberFifteenTwoThousandTwentyTwoMember_1145179B82A810D5683F462B7B1DA69E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Point Seven Zero Percent Notes Due December Fifteen Two Thousand Twenty Two [Member]</link:label>
    <link:label id="lab_mck_TwoPointSevenZeroPercentNotesDueDecemberFifteenTwoThousandTwentyTwoMember_1145179B82A810D5683F462B7B1DA69E_documentation_en-US" xlink:label="lab_mck_TwoPointSevenZeroPercentNotesDueDecemberFifteenTwoThousandTwentyTwoMember_1145179B82A810D5683F462B7B1DA69E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Point Seven Zero Percent Notes Due December Fifteen Two Thousand Twenty Two [Member]</link:label>
    <link:loc xlink:href="mck-20150331.xsd#mck_TwoPointSevenZeroPercentNotesDueDecemberFifteenTwoThousandTwentyTwoMember" xlink:label="loc_mck_TwoPointSevenZeroPercentNotesDueDecemberFifteenTwoThousandTwentyTwoMember_1145179B82A810D5683F462B7B1DA69E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mck_TwoPointSevenZeroPercentNotesDueDecemberFifteenTwoThousandTwentyTwoMember_1145179B82A810D5683F462B7B1DA69E" xlink:to="lab_mck_TwoPointSevenZeroPercentNotesDueDecemberFifteenTwoThousandTwentyTwoMember_1145179B82A810D5683F462B7B1DA69E" xlink:type="arc" />
    <link:label id="lab_mck_TwoPointEightFivePercentNotesDueMarchFifteenTwoThousandTwentyThreeMember_18A1E40EFE9FCFF70C23462B7B1E383B_terseLabel_en-US" xlink:label="lab_mck_TwoPointEightFivePercentNotesDueMarchFifteenTwoThousandTwentyThreeMember_18A1E40EFE9FCFF70C23462B7B1E383B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2.85% Notes Due March 15, 2023 [Member]</link:label>
    <link:label id="lab_mck_TwoPointEightFivePercentNotesDueMarchFifteenTwoThousandTwentyThreeMember_18A1E40EFE9FCFF70C23462B7B1E383B_label_en-US" xlink:label="lab_mck_TwoPointEightFivePercentNotesDueMarchFifteenTwoThousandTwentyThreeMember_18A1E40EFE9FCFF70C23462B7B1E383B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Point Eight Five Percent Notes Due March Fifteen Two Thousand Twenty Three [Member]</link:label>
    <link:label id="lab_mck_TwoPointEightFivePercentNotesDueMarchFifteenTwoThousandTwentyThreeMember_18A1E40EFE9FCFF70C23462B7B1E383B_documentation_en-US" xlink:label="lab_mck_TwoPointEightFivePercentNotesDueMarchFifteenTwoThousandTwentyThreeMember_18A1E40EFE9FCFF70C23462B7B1E383B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two Point Eight Five Percent Notes Due March Fifteen Two Thousand Twenty Three [Member]</link:label>
    <link:loc xlink:href="mck-20150331.xsd#mck_TwoPointEightFivePercentNotesDueMarchFifteenTwoThousandTwentyThreeMember" xlink:label="loc_mck_TwoPointEightFivePercentNotesDueMarchFifteenTwoThousandTwentyThreeMember_18A1E40EFE9FCFF70C23462B7B1E383B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mck_TwoPointEightFivePercentNotesDueMarchFifteenTwoThousandTwentyThreeMember_18A1E40EFE9FCFF70C23462B7B1E383B" xlink:to="lab_mck_TwoPointEightFivePercentNotesDueMarchFifteenTwoThousandTwentyThreeMember_18A1E40EFE9FCFF70C23462B7B1E383B" xlink:type="arc" />
    <link:label id="lab_mck_ThreePointEightZeroPercentNotesDueMarchFifteenthTwoThousandTwentyFourMember_694F4CFA25510C80ED4A462B7B1EF972_terseLabel_en-US" xlink:label="lab_mck_ThreePointEightZeroPercentNotesDueMarchFifteenthTwoThousandTwentyFourMember_694F4CFA25510C80ED4A462B7B1EF972" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">3.80% Notes Due March 15, 2024 [Member]</link:label>
    <link:label id="lab_mck_ThreePointEightZeroPercentNotesDueMarchFifteenthTwoThousandTwentyFourMember_694F4CFA25510C80ED4A462B7B1EF972_label_en-US" xlink:label="lab_mck_ThreePointEightZeroPercentNotesDueMarchFifteenthTwoThousandTwentyFourMember_694F4CFA25510C80ED4A462B7B1EF972" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Three Point Eight Zero Percent Notes Due March Fifteenth Two Thousand Twenty Four [Member]</link:label>
    <link:label id="lab_mck_ThreePointEightZeroPercentNotesDueMarchFifteenthTwoThousandTwentyFourMember_694F4CFA25510C80ED4A462B7B1EF972_documentation_en-US" xlink:label="lab_mck_ThreePointEightZeroPercentNotesDueMarchFifteenthTwoThousandTwentyFourMember_694F4CFA25510C80ED4A462B7B1EF972" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Three Point Eight Zero Percent Notes Due March Fifteenth Two Thousand Twenty Four [Member]</link:label>
    <link:loc xlink:href="mck-20150331.xsd#mck_ThreePointEightZeroPercentNotesDueMarchFifteenthTwoThousandTwentyFourMember" xlink:label="loc_mck_ThreePointEightZeroPercentNotesDueMarchFifteenthTwoThousandTwentyFourMember_694F4CFA25510C80ED4A462B7B1EF972" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mck_ThreePointEightZeroPercentNotesDueMarchFifteenthTwoThousandTwentyFourMember_694F4CFA25510C80ED4A462B7B1EF972" xlink:to="lab_mck_ThreePointEightZeroPercentNotesDueMarchFifteenthTwoThousandTwentyFourMember_694F4CFA25510C80ED4A462B7B1EF972" xlink:type="arc" />
    <link:label id="lab_mck_SevenPointSixFivePercentDebenturesDueMarchOneTwoThousandTwentySevenMember_FA47D891BD972593757C462B7B1F8417_terseLabel_en-US" xlink:label="lab_mck_SevenPointSixFivePercentDebenturesDueMarchOneTwoThousandTwentySevenMember_FA47D891BD972593757C462B7B1F8417" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">7.65% Debentures Due March 1, 2027 [Member]</link:label>
    <link:label id="lab_mck_SevenPointSixFivePercentDebenturesDueMarchOneTwoThousandTwentySevenMember_FA47D891BD972593757C462B7B1F8417_label_en-US" xlink:label="lab_mck_SevenPointSixFivePercentDebenturesDueMarchOneTwoThousandTwentySevenMember_FA47D891BD972593757C462B7B1F8417" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Seven Point Six Five Percent Debentures Due March One Two Thousand Twenty Seven [Member]</link:label>
    <link:label id="lab_mck_SevenPointSixFivePercentDebenturesDueMarchOneTwoThousandTwentySevenMember_FA47D891BD972593757C462B7B1F8417_documentation_en-US" xlink:label="lab_mck_SevenPointSixFivePercentDebenturesDueMarchOneTwoThousandTwentySevenMember_FA47D891BD972593757C462B7B1F8417" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Seven Point Six Five Percent Debentures Due March One Two Thousand Twenty Seven [Member]</link:label>
    <link:loc xlink:href="mck-20150331.xsd#mck_SevenPointSixFivePercentDebenturesDueMarchOneTwoThousandTwentySevenMember" xlink:label="loc_mck_SevenPointSixFivePercentDebenturesDueMarchOneTwoThousandTwentySevenMember_FA47D891BD972593757C462B7B1F8417" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mck_SevenPointSixFivePercentDebenturesDueMarchOneTwoThousandTwentySevenMember_FA47D891BD972593757C462B7B1F8417" xlink:to="lab_mck_SevenPointSixFivePercentDebenturesDueMarchOneTwoThousandTwentySevenMember_FA47D891BD972593757C462B7B1F8417" xlink:type="arc" />
    <link:label id="lab_mck_SixPercentNotesDueMarchOneTwoThousandFortyOneMember_98821D389B9BD0C49CCA462B7B2037FE_terseLabel_en-US" xlink:label="lab_mck_SixPercentNotesDueMarchOneTwoThousandFortyOneMember_98821D389B9BD0C49CCA462B7B2037FE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">6.00% Notes Due March 1, 2041 [Member]</link:label>
    <link:label id="lab_mck_SixPercentNotesDueMarchOneTwoThousandFortyOneMember_98821D389B9BD0C49CCA462B7B2037FE_label_en-US" xlink:label="lab_mck_SixPercentNotesDueMarchOneTwoThousandFortyOneMember_98821D389B9BD0C49CCA462B7B2037FE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Six Percent Notes Due March One Two Thousand Forty One [Member]</link:label>
    <link:label id="lab_mck_SixPercentNotesDueMarchOneTwoThousandFortyOneMember_98821D389B9BD0C49CCA462B7B2037FE_documentation_en-US" xlink:label="lab_mck_SixPercentNotesDueMarchOneTwoThousandFortyOneMember_98821D389B9BD0C49CCA462B7B2037FE" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Six Percent Notes Due March One Two Thousand Forty One [Member]</link:label>
    <link:loc xlink:href="mck-20150331.xsd#mck_SixPercentNotesDueMarchOneTwoThousandFortyOneMember" xlink:label="loc_mck_SixPercentNotesDueMarchOneTwoThousandFortyOneMember_98821D389B9BD0C49CCA462B7B2037FE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mck_SixPercentNotesDueMarchOneTwoThousandFortyOneMember_98821D389B9BD0C49CCA462B7B2037FE" xlink:to="lab_mck_SixPercentNotesDueMarchOneTwoThousandFortyOneMember_98821D389B9BD0C49CCA462B7B2037FE" xlink:type="arc" />
    <link:label id="lab_mck_FourPointEightEightPercentNotesDueMarchFifteenthTwoThousandFortyFourMember_B956E5845533887D529F462B7B2068C1_terseLabel_en-US" xlink:label="lab_mck_FourPointEightEightPercentNotesDueMarchFifteenthTwoThousandFortyFourMember_B956E5845533887D529F462B7B2068C1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4.88% Notes Due March 15, 2044 [Member]</link:label>
    <link:label id="lab_mck_FourPointEightEightPercentNotesDueMarchFifteenthTwoThousandFortyFourMember_B956E5845533887D529F462B7B2068C1_label_en-US" xlink:label="lab_mck_FourPointEightEightPercentNotesDueMarchFifteenthTwoThousandFortyFourMember_B956E5845533887D529F462B7B2068C1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four Point Eight Eight Percent Notes Due March Fifteenth Two Thousand Forty Four [Member]</link:label>
    <link:label id="lab_mck_FourPointEightEightPercentNotesDueMarchFifteenthTwoThousandFortyFourMember_B956E5845533887D529F462B7B2068C1_documentation_en-US" xlink:label="lab_mck_FourPointEightEightPercentNotesDueMarchFifteenthTwoThousandFortyFourMember_B956E5845533887D529F462B7B2068C1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four Point Eight Eight Percent Notes Due March Fifteenth Two Thousand Forty Four [Member]</link:label>
    <link:loc xlink:href="mck-20150331.xsd#mck_FourPointEightEightPercentNotesDueMarchFifteenthTwoThousandFortyFourMember" xlink:label="loc_mck_FourPointEightEightPercentNotesDueMarchFifteenthTwoThousandFortyFourMember_B956E5845533887D529F462B7B2068C1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mck_FourPointEightEightPercentNotesDueMarchFifteenthTwoThousandFortyFourMember_B956E5845533887D529F462B7B2068C1" xlink:to="lab_mck_FourPointEightEightPercentNotesDueMarchFifteenthTwoThousandFortyFourMember_B956E5845533887D529F462B7B2068C1" xlink:type="arc" />
    <link:label id="lab_mck_OtherLongTermDebtMember_ED13800404CF3994DF4E462B7B21469E_terseLabel_en-US" xlink:label="lab_mck_OtherLongTermDebtMember_ED13800404CF3994DF4E462B7B21469E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other Long Term Debt [Member]</link:label>
    <link:label id="lab_mck_OtherLongTermDebtMember_ED13800404CF3994DF4E462B7B21469E_label_en-US" xlink:label="lab_mck_OtherLongTermDebtMember_ED13800404CF3994DF4E462B7B21469E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Long Term Debt [Member]</link:label>
    <link:label id="lab_mck_OtherLongTermDebtMember_ED13800404CF3994DF4E462B7B21469E_documentation_en-US" xlink:label="lab_mck_OtherLongTermDebtMember_ED13800404CF3994DF4E462B7B21469E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Other Long Term Debt [Member]</link:label>
    <link:loc xlink:href="mck-20150331.xsd#mck_OtherLongTermDebtMember" xlink:label="loc_mck_OtherLongTermDebtMember_ED13800404CF3994DF4E462B7B21469E" xlink:type="locator" />
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_BFD1AD8CE97C081D1139462B7589B737" xlink:to="lab_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_BFD1AD8CE97C081D1139462B7589B737" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax_07E8B6019EACDBD9A40F462B75890D7F_terseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax_07E8B6019EACDBD9A40F462B75890D7F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unrealized losses on cash flow hedges arising during period, net of income tax benefit of nil, nil and nil</link:label>
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax_07E8B6019EACDBD9A40F462B75890D7F_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax_07E8B6019EACDBD9A40F462B75890D7F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax_07E8B6019EACDBD9A40F462B75890D7F" xlink:type="locator" />
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    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax_2A54A7F00CA32E25AAF1462B758A99DC_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax_2A54A7F00CA32E25AAF1462B758A99DC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax_2A54A7F00CA32E25AAF1462B758A99DC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax_2A54A7F00CA32E25AAF1462B758A99DC" xlink:to="lab_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax_2A54A7F00CA32E25AAF1462B758A99DC" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax_A5E517BE7402FCEC2D47462B758A9C7B_totalLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax_A5E517BE7402FCEC2D47462B758A9C7B" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Unrealized losses on cash flow hedges, net of tax</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax_A5E517BE7402FCEC2D47462B758A9C7B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax_A5E517BE7402FCEC2D47462B758A9C7B" xlink:to="lab_us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax_A5E517BE7402FCEC2D47462B758A9C7B" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax_23B739E481F154251D25462B758B3DE8_terseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax_23B739E481F154251D25462B758B3DE8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net actuarial gain (loss) and prior service credit (cost) arising during period, net of income tax (benefit) of ($66), $16 and ($22)</link:label>
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax_23B739E481F154251D25462B758B3DE8_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax_23B739E481F154251D25462B758B3DE8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax_23B739E481F154251D25462B758B3DE8" xlink:to="lab_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax_23B739E481F154251D25462B758B3DE8" xlink:type="arc" />
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    <link:loc xlink:href="mck-20150331.xsd#mck_DefinedBenefitPlanAmortizationofActuarialLossPriorServiceCostandTransitionObligationIncomeTaxExpenseBenefit" xlink:label="loc_mck_DefinedBenefitPlanAmortizationofActuarialLossPriorServiceCostandTransitionObligationIncomeTaxExpenseBenefit_D41A4380F918DD4C91D6462B758B8335" xlink:type="locator" />
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    <link:loc xlink:href="mck-20150331.xsd#mck_OtherComprehensiveIncomeTranslationImpactOnPensionPlansNetOfTax" xlink:label="loc_mck_OtherComprehensiveIncomeTranslationImpactOnPensionPlansNetOfTax_DAB0FDE2769BF147C0E9462B758C53CA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mck_OtherComprehensiveIncomeTranslationImpactOnPensionPlansNetOfTax_DAB0FDE2769BF147C0E9462B758C53CA" xlink:to="lab_mck_OtherComprehensiveIncomeTranslationImpactOnPensionPlansNetOfTax_DAB0FDE2769BF147C0E9462B758C53CA" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax_F15400D5DD52D508D559462B758D051A_terseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax_F15400D5DD52D508D559462B758D051A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Reclassified to income statement, net of income tax expense of nil, $1 and nil</link:label>
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax_F15400D5DD52D508D559462B758D051A_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax_F15400D5DD52D508D559462B758D051A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Net of Tax</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax_F15400D5DD52D508D559462B758D051A" xlink:to="lab_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax_F15400D5DD52D508D559462B758D051A" xlink:type="arc" />
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    <link:label id="lab_mck_DefinedBenefitPlanActuarialLossesPercentageExceedingGreaterOfProjectedBenefitObligationOrMarketValueOfAssets_891680008C5ECD7034C849414DB9A6F5_documentation_en-US" xlink:label="lab_mck_DefinedBenefitPlanActuarialLossesPercentageExceedingGreaterOfProjectedBenefitObligationOrMarketValueOfAssets_891680008C5ECD7034C849414DB9A6F5" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Unrecognized actuarial losses exceeding 10% of the greater of the projected benefit obligation or the market value of assets are amortized straight-line over the average remaining future service periods.</link:label>
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    <link:label id="lab_mck_GuaranteeObligationsExposureExpiringinYearFiveThereafter_CD1A898FE34B5695EC6CB3F87F5E66D2_documentation_en-US" xlink:label="lab_mck_GuaranteeObligationsExposureExpiringinYearFiveThereafter_CD1A898FE34B5695EC6CB3F87F5E66D2" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Guarantee Obligations Exposure Expiring in Year Five Thereafter</link:label>
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    <link:label id="lab_us-gaap_LettersOfCreditOutstandingAmount_192394AA63F2C8CD9FDFB54B83741F8C_terseLabel_en-US" xlink:label="lab_us-gaap_LettersOfCreditOutstandingAmount_192394AA63F2C8CD9FDFB54B83741F8C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Letters of credit outstanding</link:label>
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