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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" xlink:label="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_AEE15532B788026AC3A491F9F718022A" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayable_8D65034C161FDAE676B091F9F7189200" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities_88E49AA6C1D2311E7F2391F9F718B10B" xlink:type="locator" />
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    <link:label id="lab_us-gaap_IncreaseDecreaseInAccruedLiabilities_C996D27E2A6F73988C5891F9F7188E04_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccruedLiabilities_C996D27E2A6F73988C5891F9F7188E04" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accrued liabilities and other</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInAccruedLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedLiabilities_C996D27E2A6F73988C5891F9F7188E04" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInAccruedLiabilities_C996D27E2A6F73988C5891F9F7188E04" xlink:to="lab_us-gaap_IncreaseDecreaseInAccruedLiabilities_C996D27E2A6F73988C5891F9F7188E04" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable_3CCEDBAF34BDA3A8CB7991F9F71817E2_verboseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable_3CCEDBAF34BDA3A8CB7991F9F71817E2" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Income taxes, current</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable" xlink:label="loc_us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable_3CCEDBAF34BDA3A8CB7991F9F71817E2" xlink:type="locator" />
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_6FBA0E5DD635AAAF8CA991F9F718B88D_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_6FBA0E5DD635AAAF8CA991F9F718B88D" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash provided by operating activities</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_6FBA0E5DD635AAAF8CA991F9F718B88D" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities_FC6A8FE1DEB72DEA3B1B91F9F7192C42_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities_FC6A8FE1DEB72DEA3B1B91F9F7192C42" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from redemption of marketable securities</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities" xlink:label="loc_us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities_FC6A8FE1DEB72DEA3B1B91F9F7192C42" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PaymentsToAcquireInvestments_1BBBB6CA0B9DF1B8CD5F91F9F719DAF8_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireInvestments_1BBBB6CA0B9DF1B8CD5F91F9F719DAF8" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Purchase of investments</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsToAcquireInvestments" xlink:label="loc_us-gaap_PaymentsToAcquireInvestments_1BBBB6CA0B9DF1B8CD5F91F9F719DAF8" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_2DB36CCC87A6AC7BB9E591F9F71987BC_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_2DB36CCC87A6AC7BB9E591F9F71987BC" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Other, net</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_A833625BE5065EF77CAF91F9F720FB7E_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_A833625BE5065EF77CAF91F9F720FB7E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Financing Activities</link:label>
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    <link:label id="lab_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_85FFB3DE8CBD8B740BF591F9F720A6D5_terseLabel_en-US" xlink:label="lab_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_85FFB3DE8CBD8B740BF591F9F720A6D5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Effect of exchange rate changes on cash and cash equivalents</link:label>
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    <link:label id="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_6BF704C065CE071FAD2691F9F720A94B_totalLabel_en-US" xlink:label="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_6BF704C065CE071FAD2691F9F720A94B" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net increase (decrease) in cash and cash equivalents</link:label>
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    <link:label id="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_5EE8EF2BB2DE6E160C1091F9F720AFE2_periodStartLabel_en-US" xlink:label="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_5EE8EF2BB2DE6E160C1091F9F720AFE2" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Cash and cash equivalents at beginning of period</link:label>
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    <link:label id="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_29CAE4BC901674518B9391F9F72163F6_periodEndLabel_en-US" xlink:label="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_29CAE4BC901674518B9391F9F72163F6" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Cash and cash equivalents at end of period</link:label>
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    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_1A526CCAFDE808C960A369378B3E52A9_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_1A526CCAFDE808C960A369378B3E52A9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2020 (remaining nine months)</link:label>
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    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_E497A08110E49A47D1D369378B3EFF03_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_E497A08110E49A47D1D369378B3EFF03" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2021</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_OperatingLeaseWeightedAverageRemainingLeaseTerm1_07AC0AFA8C3FA3C77963984FA4483B8C" xlink:to="lab_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_07AC0AFA8C3FA3C77963984FA4483B8C" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_23D80630FE1F903B56B8984FA448F41A_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_23D80630FE1F903B56B8984FA448F41A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Weighted-average discount rate - operating leases</link:label>
    <link:label id="lab_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_23D80630FE1F903B56B8984FA448F41A_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_23D80630FE1F903B56B8984FA448F41A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Lease, Weighted Average Discount Rate, Percent</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent" xlink:label="loc_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_23D80630FE1F903B56B8984FA448F41A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_23D80630FE1F903B56B8984FA448F41A" xlink:to="lab_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_23D80630FE1F903B56B8984FA448F41A" xlink:type="arc" />
    <link:label id="lab_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock_2749124C23C27F30DB5B6425CAD5D6D5_terseLabel_en-US" xlink:label="lab_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock_2749124C23C27F30DB5B6425CAD5D6D5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Basis of Presentation</link:label>
    <link:label id="lab_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock_2749124C23C27F30DB5B6425CAD5D6D5_label_en-US" xlink:label="lab_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock_2749124C23C27F30DB5B6425CAD5D6D5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock" xlink:label="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock_2749124C23C27F30DB5B6425CAD5D6D5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock_2749124C23C27F30DB5B6425CAD5D6D5" xlink:to="lab_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock_2749124C23C27F30DB5B6425CAD5D6D5" xlink:type="arc" />
    <link:label id="lab_ctas_ScheduleOfOtherAssetsTable_0E6D41265FD4B4D63E7168B112E7E480_terseLabel_en-US" xlink:label="lab_ctas_ScheduleOfOtherAssetsTable_0E6D41265FD4B4D63E7168B112E7E480" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Other Assets [Table]</link:label>
    <link:label id="lab_ctas_ScheduleOfOtherAssetsTable_0E6D41265FD4B4D63E7168B112E7E480_label_en-US" xlink:label="lab_ctas_ScheduleOfOtherAssetsTable_0E6D41265FD4B4D63E7168B112E7E480" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Other Assets [Table]</link:label>
    <link:label id="lab_ctas_ScheduleOfOtherAssetsTable_0E6D41265FD4B4D63E7168B112E7E480_documentation_en-US" xlink:label="lab_ctas_ScheduleOfOtherAssetsTable_0E6D41265FD4B4D63E7168B112E7E480" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This element represents details of other assets.</link:label>
    <link:loc xlink:href="ctas-20190831.xsd#ctas_ScheduleOfOtherAssetsTable" xlink:label="loc_ctas_ScheduleOfOtherAssetsTable_0E6D41265FD4B4D63E7168B112E7E480" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctas_ScheduleOfOtherAssetsTable_0E6D41265FD4B4D63E7168B112E7E480" xlink:to="lab_ctas_ScheduleOfOtherAssetsTable_0E6D41265FD4B4D63E7168B112E7E480" xlink:type="arc" />
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_F302DC2E97E4751BACC568B112E79EAE_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_F302DC2E97E4751BACC568B112E79EAE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Assets by Major Class [Axis]</link:label>
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_F302DC2E97E4751BACC568B112E79EAE_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_F302DC2E97E4751BACC568B112E79EAE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Assets by Major Class [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_F302DC2E97E4751BACC568B112E79EAE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_F302DC2E97E4751BACC568B112E79EAE" xlink:to="lab_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_F302DC2E97E4751BACC568B112E79EAE" xlink:type="arc" />
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_E7A94F2E363FAED62D1F68B112E7978B_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_E7A94F2E363FAED62D1F68B112E7978B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Assets, Major Class Name [Domain]</link:label>
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_E7A94F2E363FAED62D1F68B112E7978B_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_E7A94F2E363FAED62D1F68B112E7978B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Assets, Major Class Name [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_E7A94F2E363FAED62D1F68B112E7978B" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ServiceAgreementsMember_AABDEF9DB07DB619798368B112EDC584_terseLabel_en-US" xlink:label="lab_us-gaap_ServiceAgreementsMember_AABDEF9DB07DB619798368B112EDC584" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Service Contracts</link:label>
    <link:label id="lab_us-gaap_ServiceAgreementsMember_AABDEF9DB07DB619798368B112EDC584_label_en-US" xlink:label="lab_us-gaap_ServiceAgreementsMember_AABDEF9DB07DB619798368B112EDC584" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Service Agreements [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ServiceAgreementsMember" xlink:label="loc_us-gaap_ServiceAgreementsMember_AABDEF9DB07DB619798368B112EDC584" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ServiceAgreementsMember_AABDEF9DB07DB619798368B112EDC584" xlink:to="lab_us-gaap_ServiceAgreementsMember_AABDEF9DB07DB619798368B112EDC584" xlink:type="arc" />
    <link:label id="lab_ctas_OtherAssetsAxis_B4C2F75AF832648363BE68B112EDAF60_terseLabel_en-US" xlink:label="lab_ctas_OtherAssetsAxis_B4C2F75AF832648363BE68B112EDAF60" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other Assets [Axis]</link:label>
    <link:label id="lab_ctas_OtherAssetsAxis_B4C2F75AF832648363BE68B112EDAF60_label_en-US" xlink:label="lab_ctas_OtherAssetsAxis_B4C2F75AF832648363BE68B112EDAF60" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Assets [Axis]</link:label>
    <link:label id="lab_ctas_OtherAssetsAxis_B4C2F75AF832648363BE68B112EDAF60_documentation_en-US" xlink:label="lab_ctas_OtherAssetsAxis_B4C2F75AF832648363BE68B112EDAF60" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This element represents other noncurrent assets.</link:label>
    <link:loc xlink:href="ctas-20190831.xsd#ctas_OtherAssetsAxis" xlink:label="loc_ctas_OtherAssetsAxis_B4C2F75AF832648363BE68B112EDAF60" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctas_OtherAssetsAxis_B4C2F75AF832648363BE68B112EDAF60" xlink:to="lab_ctas_OtherAssetsAxis_B4C2F75AF832648363BE68B112EDAF60" xlink:type="arc" />
    <link:label id="lab_ctas_OtherAssetsDomain_55328388F9468651182F68B112ED305F_terseLabel_en-US" xlink:label="lab_ctas_OtherAssetsDomain_55328388F9468651182F68B112ED305F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other Assets [Domain]</link:label>
    <link:label id="lab_ctas_OtherAssetsDomain_55328388F9468651182F68B112ED305F_label_en-US" xlink:label="lab_ctas_OtherAssetsDomain_55328388F9468651182F68B112ED305F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Assets [Domain]</link:label>
    <link:label id="lab_ctas_OtherAssetsDomain_55328388F9468651182F68B112ED305F_documentation_en-US" xlink:label="lab_ctas_OtherAssetsDomain_55328388F9468651182F68B112ED305F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This element represents details of other assets.</link:label>
    <link:loc xlink:href="ctas-20190831.xsd#ctas_OtherAssetsDomain" xlink:label="loc_ctas_OtherAssetsDomain_55328388F9468651182F68B112ED305F" xlink:type="locator" />
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    <link:label id="lab_ctas_CapitalizedContractCostMember_8F8BB8C437361046A6E168B112EE7D1C_terseLabel_en-US" xlink:label="lab_ctas_CapitalizedContractCostMember_8F8BB8C437361046A6E168B112EE7D1C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Capitalized contract costs</link:label>
    <link:label id="lab_ctas_CapitalizedContractCostMember_8F8BB8C437361046A6E168B112EE7D1C_label_en-US" xlink:label="lab_ctas_CapitalizedContractCostMember_8F8BB8C437361046A6E168B112EE7D1C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Capitalized Contract Cost [Member]</link:label>
    <link:label id="lab_ctas_CapitalizedContractCostMember_8F8BB8C437361046A6E168B112EE7D1C_documentation_en-US" xlink:label="lab_ctas_CapitalizedContractCostMember_8F8BB8C437361046A6E168B112EE7D1C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Capitalized Contract Cost [Member]</link:label>
    <link:loc xlink:href="ctas-20190831.xsd#ctas_CapitalizedContractCostMember" xlink:label="loc_ctas_CapitalizedContractCostMember_8F8BB8C437361046A6E168B112EE7D1C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctas_CapitalizedContractCostMember_8F8BB8C437361046A6E168B112EE7D1C" xlink:to="lab_ctas_CapitalizedContractCostMember_8F8BB8C437361046A6E168B112EE7D1C" xlink:type="arc" />
    <link:label id="lab_us-gaap_NoncompeteAgreementsMember_E4F1AF8DCD067159C17768B112EEEE7D_terseLabel_en-US" xlink:label="lab_us-gaap_NoncompeteAgreementsMember_E4F1AF8DCD067159C17768B112EEEE7D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Noncompete and consulting agreements</link:label>
    <link:label id="lab_us-gaap_NoncompeteAgreementsMember_E4F1AF8DCD067159C17768B112EEEE7D_label_en-US" xlink:label="lab_us-gaap_NoncompeteAgreementsMember_E4F1AF8DCD067159C17768B112EEEE7D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Noncompete Agreements [Member]</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_NoncompeteAgreementsMember_E4F1AF8DCD067159C17768B112EEEE7D" xlink:to="lab_us-gaap_NoncompeteAgreementsMember_E4F1AF8DCD067159C17768B112EEEE7D" xlink:type="arc" />
    <link:label id="lab_ctas_OtherMiscellaneousAssetsMember_1EBDA070EB14691C8F6A68B112EEE850_terseLabel_en-US" xlink:label="lab_ctas_OtherMiscellaneousAssetsMember_1EBDA070EB14691C8F6A68B112EEE850" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other</link:label>
    <link:label id="lab_ctas_OtherMiscellaneousAssetsMember_1EBDA070EB14691C8F6A68B112EEE850_label_en-US" xlink:label="lab_ctas_OtherMiscellaneousAssetsMember_1EBDA070EB14691C8F6A68B112EEE850" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Miscellaneous Assets [Member]</link:label>
    <link:label id="lab_ctas_OtherMiscellaneousAssetsMember_1EBDA070EB14691C8F6A68B112EEE850_documentation_en-US" xlink:label="lab_ctas_OtherMiscellaneousAssetsMember_1EBDA070EB14691C8F6A68B112EEE850" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This element represents details of assets, which have not been itemized or categorized in footnotes to financial statements and are a component of other assets.</link:label>
    <link:loc xlink:href="ctas-20190831.xsd#ctas_OtherMiscellaneousAssetsMember" xlink:label="loc_ctas_OtherMiscellaneousAssetsMember_1EBDA070EB14691C8F6A68B112EEE850" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctas_OtherMiscellaneousAssetsMember_1EBDA070EB14691C8F6A68B112EEE850" xlink:to="lab_ctas_OtherMiscellaneousAssetsMember_1EBDA070EB14691C8F6A68B112EEE850" xlink:type="arc" />
    <link:label id="lab_ctas_OtherAssetsLineItems_A989E56756AE3BB3556168B112EE3B86_terseLabel_en-US" xlink:label="lab_ctas_OtherAssetsLineItems_A989E56756AE3BB3556168B112EE3B86" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Information regarding service contracts and other assets</link:label>
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    <link:label id="lab_ctas_OtherAssetsLineItems_A989E56756AE3BB3556168B112EE3B86_documentation_en-US" xlink:label="lab_ctas_OtherAssetsLineItems_A989E56756AE3BB3556168B112EE3B86" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US" />
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    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsGross_0CF202395254565321C668B112EE97B5_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsGross_0CF202395254565321C668B112EE97B5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Assets, Gross</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsGross" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_0CF202395254565321C668B112EE97B5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsGross_0CF202395254565321C668B112EE97B5" xlink:to="lab_us-gaap_FiniteLivedIntangibleAssetsGross_0CF202395254565321C668B112EE97B5" xlink:type="arc" />
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