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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_CondensedFinancialInformationOfParentCompanyOnlyDisclosureTextBlock" xlink:label="loc_us-gaap_CondensedFinancialInformationOfParentCompanyOnlyDisclosureTextBlock_14BD381235EF23889F2A33A5438984F9" xlink:type="locator" />
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    <link:label id="lab_us-gaap_EarningsPerShareAbstract_0279702C75FE35C76F303479796D74F1_label_en-US" xlink:label="lab_us-gaap_EarningsPerShareAbstract_0279702C75FE35C76F303479796D74F1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Earnings Per Share [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_EarningsPerShareAbstract" xlink:label="loc_us-gaap_EarningsPerShareAbstract_0279702C75FE35C76F303479796D74F1" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_9BA202B79B55A7033DF93479796D25EC_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_9BA202B79B55A7033DF93479796D25EC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Computation of basic and diluted earnings per share</link:label>
    <link:label id="lab_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_9BA202B79B55A7033DF93479796D25EC_label_en-US" xlink:label="lab_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_9BA202B79B55A7033DF93479796D25EC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_9BA202B79B55A7033DF93479796D25EC" xlink:type="locator" />
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    <link:label id="lab_us-gaap_EarningsPerShareTextBlock_A1912B5A33FACC68838034797BCB40F0_terseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerShareTextBlock_A1912B5A33FACC68838034797BCB40F0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Earnings per Share</link:label>
    <link:label id="lab_us-gaap_EarningsPerShareTextBlock_A1912B5A33FACC68838034797BCB40F0_label_en-US" xlink:label="lab_us-gaap_EarningsPerShareTextBlock_A1912B5A33FACC68838034797BCB40F0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Earnings Per Share [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_EarningsPerShareTextBlock" xlink:label="loc_us-gaap_EarningsPerShareTextBlock_A1912B5A33FACC68838034797BCB40F0" xlink:type="locator" />
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    <link:label id="lab_ctas_GoodwillServiceContractsAndOtherAssetsAbstract_2FB899175ED51FC35216CDDF33B83D18_label_en-US" xlink:label="lab_ctas_GoodwillServiceContractsAndOtherAssetsAbstract_2FB899175ED51FC35216CDDF33B83D18" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Goodwill, Service Contracts and Other Assets [Abstract]</link:label>
    <link:label id="lab_ctas_GoodwillServiceContractsAndOtherAssetsAbstract_2FB899175ED51FC35216CDDF33B83D18_documentation_en-US" xlink:label="lab_ctas_GoodwillServiceContractsAndOtherAssetsAbstract_2FB899175ED51FC35216CDDF33B83D18" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">-- None. No documentation exists for this element. --</link:label>
    <link:loc xlink:href="ctas-20120531.xsd#ctas_GoodwillServiceContractsAndOtherAssetsAbstract" xlink:label="loc_ctas_GoodwillServiceContractsAndOtherAssetsAbstract_2FB899175ED51FC35216CDDF33B83D18" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ScheduleOfGoodwillTable_EB0872C5389C7D83D298CDDF33B881C7_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfGoodwillTable_EB0872C5389C7D83D298CDDF33B881C7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Goodwill [Table]</link:label>
    <link:label id="lab_us-gaap_ScheduleOfGoodwillTable_EB0872C5389C7D83D298CDDF33B881C7_label_en-US" xlink:label="lab_us-gaap_ScheduleOfGoodwillTable_EB0872C5389C7D83D298CDDF33B881C7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Goodwill [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ScheduleOfGoodwillTable" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_EB0872C5389C7D83D298CDDF33B881C7" xlink:type="locator" />
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    <link:label id="lab_us-gaap_StatementBusinessSegmentsAxis_C2C21D8BEECE072DE70ACDDF33B85C81_terseLabel_en-US" xlink:label="lab_us-gaap_StatementBusinessSegmentsAxis_C2C21D8BEECE072DE70ACDDF33B85C81" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Statement, Business Segments [Axis]</link:label>
    <link:label id="lab_us-gaap_StatementBusinessSegmentsAxis_C2C21D8BEECE072DE70ACDDF33B85C81_label_en-US" xlink:label="lab_us-gaap_StatementBusinessSegmentsAxis_C2C21D8BEECE072DE70ACDDF33B85C81" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statement, Business Segments [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_C2C21D8BEECE072DE70ACDDF33B85C81" xlink:type="locator" />
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    <link:label id="lab_us-gaap_SegmentDomain_EF47C1F54429204F9AF3CDDF33B825E1_terseLabel_en-US" xlink:label="lab_us-gaap_SegmentDomain_EF47C1F54429204F9AF3CDDF33B825E1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Segment [Domain]</link:label>
    <link:label id="lab_us-gaap_SegmentDomain_EF47C1F54429204F9AF3CDDF33B825E1_label_en-US" xlink:label="lab_us-gaap_SegmentDomain_EF47C1F54429204F9AF3CDDF33B825E1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Segment [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_EF47C1F54429204F9AF3CDDF33B825E1" xlink:type="locator" />
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    <link:label id="lab_ctas_RentalUniformsAndAncillaryProductsMember_52B156461EACFFC887F1CDDF33B89467_terseLabel_en-US" xlink:label="lab_ctas_RentalUniformsAndAncillaryProductsMember_52B156461EACFFC887F1CDDF33B89467" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Rental Uniforms and Ancillary Products [Member]</link:label>
    <link:label id="lab_ctas_RentalUniformsAndAncillaryProductsMember_52B156461EACFFC887F1CDDF33B89467_label_en-US" xlink:label="lab_ctas_RentalUniformsAndAncillaryProductsMember_52B156461EACFFC887F1CDDF33B89467" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Rental Uniforms and Ancillary Products [Member]</link:label>
    <link:label id="lab_ctas_RentalUniformsAndAncillaryProductsMember_52B156461EACFFC887F1CDDF33B89467_documentation_en-US" xlink:label="lab_ctas_RentalUniformsAndAncillaryProductsMember_52B156461EACFFC887F1CDDF33B89467" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the entity's Rental Uniforms and Ancillary Products reporting segment.</link:label>
    <link:loc xlink:href="ctas-20120531.xsd#ctas_RentalUniformsAndAncillaryProductsMember" xlink:label="loc_ctas_RentalUniformsAndAncillaryProductsMember_52B156461EACFFC887F1CDDF33B89467" xlink:type="locator" />
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    <link:label id="lab_ctas_UniformDirectSalesMember_FB5B0EED4B1A2FAD121ACDDF33B8780B_terseLabel_en-US" xlink:label="lab_ctas_UniformDirectSalesMember_FB5B0EED4B1A2FAD121ACDDF33B8780B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Uniform Direct Sales [Member]</link:label>
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    <link:label id="lab_ctas_UniformDirectSalesMember_FB5B0EED4B1A2FAD121ACDDF33B8780B_documentation_en-US" xlink:label="lab_ctas_UniformDirectSalesMember_FB5B0EED4B1A2FAD121ACDDF33B8780B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the entity's Uniform Direct Sales reporting segment.</link:label>
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    <link:label id="lab_ctas_FirstAidSafetyAndFireProtectionMember_2BA744568E2C09207DCFCDDF33B8BA88_terseLabel_en-US" xlink:label="lab_ctas_FirstAidSafetyAndFireProtectionMember_2BA744568E2C09207DCFCDDF33B8BA88" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">First Aid, Safety and Fire Protection [Member]</link:label>
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    <link:label id="lab_ctas_FirstAidSafetyAndFireProtectionMember_2BA744568E2C09207DCFCDDF33B8BA88_documentation_en-US" xlink:label="lab_ctas_FirstAidSafetyAndFireProtectionMember_2BA744568E2C09207DCFCDDF33B8BA88" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the entity's First Aid, Safety and Fire Protection reporting segment.</link:label>
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    <link:label id="lab_ctas_DocumentManagementMember_234444A835B420070EB5CDDF33B8104A_terseLabel_en-US" xlink:label="lab_ctas_DocumentManagementMember_234444A835B420070EB5CDDF33B8104A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Document Management [Member]</link:label>
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    <link:label id="lab_ctas_DocumentManagementMember_234444A835B420070EB5CDDF33B8104A_documentation_en-US" xlink:label="lab_ctas_DocumentManagementMember_234444A835B420070EB5CDDF33B8104A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the entity's Document Management reporting segment.</link:label>
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    <link:label id="lab_us-gaap_GoodwillLineItems_24B2279CA182C0AAF273CDDF33B8138F_label_en-US" xlink:label="lab_us-gaap_GoodwillLineItems_24B2279CA182C0AAF273CDDF33B8138F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Goodwill [Line Items]</link:label>
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    <link:label id="lab_us-gaap_GoodwillRollForward_C3F5EE1AAAD165C89A79CDDF33B8E8FA_label_en-US" xlink:label="lab_us-gaap_GoodwillRollForward_C3F5EE1AAAD165C89A79CDDF33B8E8FA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Goodwill [Roll Forward]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_GoodwillRollForward" xlink:label="loc_us-gaap_GoodwillRollForward_C3F5EE1AAAD165C89A79CDDF33B8E8FA" xlink:type="locator" />
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    <link:label id="lab_us-gaap_Goodwill_9F5C434170AFA8086AE4CDDF33B9FCA4_label_en-US" xlink:label="lab_us-gaap_Goodwill_9F5C434170AFA8086AE4CDDF33B9FCA4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Goodwill</link:label>
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    <link:label id="lab_us-gaap_LiabilitiesCurrentAbstract_91BB474587475D39E522CDDF32CCBA2C_label_en-US" xlink:label="lab_us-gaap_LiabilitiesCurrentAbstract_91BB474587475D39E522CDDF32CCBA2C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Liabilities, Current [Abstract]</link:label>
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    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm_91399DE01E6626E9AEEECDDF3338667E_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm_91399DE01E6626E9AEEECDDF3338667E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm_91399DE01E6626E9AEEECDDF3338667E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm_91399DE01E6626E9AEEECDDF3338667E" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm_91399DE01E6626E9AEEECDDF3338667E" xlink:type="arc" />
    <link:label id="lab_ctas_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardVestingPeriod_674436A9C9291C604C54CDDF33387102_terseLabel_en-US" xlink:label="lab_ctas_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardVestingPeriod_674436A9C9291C604C54CDDF33387102" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Vesting period of awards (in years)</link:label>
    <link:label id="lab_ctas_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardVestingPeriod_674436A9C9291C604C54CDDF33387102_label_en-US" xlink:label="lab_ctas_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardVestingPeriod_674436A9C9291C604C54CDDF33387102" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Award Vesting Period</link:label>
    <link:label id="lab_ctas_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardVestingPeriod_674436A9C9291C604C54CDDF33387102_documentation_en-US" xlink:label="lab_ctas_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardVestingPeriod_674436A9C9291C604C54CDDF33387102" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Award Vesting Period</link:label>
    <link:loc xlink:href="ctas-20120531.xsd#ctas_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardVestingPeriod" xlink:label="loc_ctas_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardVestingPeriod_674436A9C9291C604C54CDDF33387102" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctas_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardVestingPeriod_674436A9C9291C604C54CDDF33387102" xlink:to="lab_ctas_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardVestingPeriod_674436A9C9291C604C54CDDF33387102" xlink:type="arc" />
    <link:label id="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_5DEB986BEE61C007F3B8CDDF3338C8F7_terseLabel_en-US" xlink:label="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_5DEB986BEE61C007F3B8CDDF3338C8F7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unrecognized compensation cost related to unvested stock options and restricted stock</link:label>
    <link:label id="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_5DEB986BEE61C007F3B8CDDF3338C8F7_label_en-US" xlink:label="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_5DEB986BEE61C007F3B8CDDF3338C8F7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_5DEB986BEE61C007F3B8CDDF3338C8F7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_5DEB986BEE61C007F3B8CDDF3338C8F7" xlink:to="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_5DEB986BEE61C007F3B8CDDF3338C8F7" xlink:type="arc" />
    <link:label id="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition_3EBD77C975414D8A0C92CDDF33389620_terseLabel_en-US" xlink:label="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition_3EBD77C975414D8A0C92CDDF33389620" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Weighted average over which stock options and restricted stock costs will be recognized (in years)</link:label>
    <link:label id="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition_3EBD77C975414D8A0C92CDDF33389620_label_en-US" xlink:label="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition_3EBD77C975414D8A0C92CDDF33389620" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition_3EBD77C975414D8A0C92CDDF33389620" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LongTermNotesPayable_DC4584093808C02164C7CAA372BDB751_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermNotesPayable_DC4584093808C02164C7CAA372BDB751" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Long-term notes</link:label>
    <link:label id="lab_us-gaap_LongTermNotesPayable_DC4584093808C02164C7CAA372BDB751_label_en-US" xlink:label="lab_us-gaap_LongTermNotesPayable_DC4584093808C02164C7CAA372BDB751" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Notes Payable, Noncurrent</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_LongTermNotesPayable" xlink:label="loc_us-gaap_LongTermNotesPayable_DC4584093808C02164C7CAA372BDB751" xlink:type="locator" />
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    <link:label id="lab_us-gaap_RevenuesAbstract_9F7344D116BAE2192677CAA17A17B09E_terseLabel_en-US" xlink:label="lab_us-gaap_RevenuesAbstract_9F7344D116BAE2192677CAA17A17B09E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Revenue:</link:label>
    <link:label id="lab_us-gaap_RevenuesAbstract_9F7344D116BAE2192677CAA17A17B09E_label_en-US" xlink:label="lab_us-gaap_RevenuesAbstract_9F7344D116BAE2192677CAA17A17B09E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revenues [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_RevenuesAbstract" xlink:label="loc_us-gaap_RevenuesAbstract_9F7344D116BAE2192677CAA17A17B09E" xlink:type="locator" />
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    <link:label id="lab_ctas_RevenueRentalUniformsAndAncillaryProducts_8B12B617E62D0FC7503DCAA17A18590A_terseLabel_en-US" xlink:label="lab_ctas_RevenueRentalUniformsAndAncillaryProducts_8B12B617E62D0FC7503DCAA17A18590A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Rental uniforms and ancillary products</link:label>
    <link:label id="lab_ctas_RevenueRentalUniformsAndAncillaryProducts_8B12B617E62D0FC7503DCAA17A18590A_label_en-US" xlink:label="lab_ctas_RevenueRentalUniformsAndAncillaryProducts_8B12B617E62D0FC7503DCAA17A18590A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revenue Rental Uniforms and Ancillary Products</link:label>
    <link:label id="lab_ctas_RevenueRentalUniformsAndAncillaryProducts_8B12B617E62D0FC7503DCAA17A18590A_documentation_en-US" xlink:label="lab_ctas_RevenueRentalUniformsAndAncillaryProducts_8B12B617E62D0FC7503DCAA17A18590A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Revenue earned from the Rental Uniforms and Ancillary Products operating segment.</link:label>
    <link:loc xlink:href="ctas-20120531.xsd#ctas_RevenueRentalUniformsAndAncillaryProducts" xlink:label="loc_ctas_RevenueRentalUniformsAndAncillaryProducts_8B12B617E62D0FC7503DCAA17A18590A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctas_RevenueRentalUniformsAndAncillaryProducts_8B12B617E62D0FC7503DCAA17A18590A" xlink:to="lab_ctas_RevenueRentalUniformsAndAncillaryProducts_8B12B617E62D0FC7503DCAA17A18590A" xlink:type="arc" />
    <link:label id="lab_ctas_RevenueOtherServices_CCB14B1ECECEC4944316CAA17A184A25_terseLabel_en-US" xlink:label="lab_ctas_RevenueOtherServices_CCB14B1ECECEC4944316CAA17A184A25" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other services</link:label>
    <link:label id="lab_ctas_RevenueOtherServices_CCB14B1ECECEC4944316CAA17A184A25_label_en-US" xlink:label="lab_ctas_RevenueOtherServices_CCB14B1ECECEC4944316CAA17A184A25" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revenue, Other Services</link:label>
    <link:label id="lab_ctas_RevenueOtherServices_CCB14B1ECECEC4944316CAA17A184A25_documentation_en-US" xlink:label="lab_ctas_RevenueOtherServices_CCB14B1ECECEC4944316CAA17A184A25" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Revenue earned on providing other services, which is recorded in the Uniform Direct Sales, First Aid, Safety and Fire Protection Services and Document Management Services operating segments. It excludes revenue earned from the Rental Uniforms and Ancillary Products operating segment.</link:label>
    <link:loc xlink:href="ctas-20120531.xsd#ctas_RevenueOtherServices" xlink:label="loc_ctas_RevenueOtherServices_CCB14B1ECECEC4944316CAA17A184A25" xlink:type="locator" />
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    <link:label id="lab_us-gaap_IncomeLossFromEquityMethodInvestments_484F8F8E973B65957C4FCAA17A193C37_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeLossFromEquityMethodInvestments_484F8F8E973B65957C4FCAA17A193C37" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Equity in net income of affiliates</link:label>
    <link:label id="lab_us-gaap_IncomeLossFromEquityMethodInvestments_484F8F8E973B65957C4FCAA17A193C37_label_en-US" xlink:label="lab_us-gaap_IncomeLossFromEquityMethodInvestments_484F8F8E973B65957C4FCAA17A193C37" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income (Loss) from Equity Method Investments</link:label>
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    <link:label id="lab_us-gaap_CostsAndExpensesAbstract_305C064BD412BA7BABC4CAA17A191BBB_verboseLabel_en-US" xlink:label="lab_us-gaap_CostsAndExpensesAbstract_305C064BD412BA7BABC4CAA17A191BBB" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Costs and expenses (income):</link:label>
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    <link:label id="lab_ctas_CostOfRentalUniformsAndAncillaryProducts_0EEEEF790C24BA7AE744CAA17A19AAFC_terseLabel_en-US" xlink:label="lab_ctas_CostOfRentalUniformsAndAncillaryProducts_0EEEEF790C24BA7AE744CAA17A19AAFC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cost of rental uniforms and ancillary products</link:label>
    <link:label id="lab_ctas_CostOfRentalUniformsAndAncillaryProducts_0EEEEF790C24BA7AE744CAA17A19AAFC_label_en-US" xlink:label="lab_ctas_CostOfRentalUniformsAndAncillaryProducts_0EEEEF790C24BA7AE744CAA17A19AAFC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cost of Rental Uniforms and Ancillary Products</link:label>
    <link:label id="lab_ctas_CostOfRentalUniformsAndAncillaryProducts_0EEEEF790C24BA7AE744CAA17A19AAFC_documentation_en-US" xlink:label="lab_ctas_CostOfRentalUniformsAndAncillaryProducts_0EEEEF790C24BA7AE744CAA17A19AAFC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The aggregate costs related to the rental of uniforms and ancillary products, including the costs of the products and the costs of the services rendered during the reporting period.</link:label>
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    <link:label id="lab_ctas_CostOfOtherServices_0D5ED8FBE99CECE76EE7CAA17A194AA7_terseLabel_en-US" xlink:label="lab_ctas_CostOfOtherServices_0D5ED8FBE99CECE76EE7CAA17A194AA7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cost of other services</link:label>
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    <link:label id="lab_ctas_CostOfOtherServices_0D5ED8FBE99CECE76EE7CAA17A194AA7_documentation_en-US" xlink:label="lab_ctas_CostOfOtherServices_0D5ED8FBE99CECE76EE7CAA17A194AA7" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The aggregate costs related to the sale of and servicing of other services such as uniform direct sales, first aid, safety and fire protection services and document management services, including the costs of the products and the costs of the services rendered during the reporting period.</link:label>
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    <link:label id="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_EEEEA06121D95649C7B7D85CB3433BBB_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_EEEEA06121D95649C7B7D85CB3433BBB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Maturities of long term debt, next twelve months</link:label>
    <link:label id="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_EEEEA06121D95649C7B7D85CB3433BBB_label_en-US" xlink:label="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_EEEEA06121D95649C7B7D85CB3433BBB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_EEEEA06121D95649C7B7D85CB3433BBB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_EEEEA06121D95649C7B7D85CB3433BBB" xlink:to="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_EEEEA06121D95649C7B7D85CB3433BBB" xlink:type="arc" />
    <link:label id="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_89AD9375212D46728896D85CB3435840_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_89AD9375212D46728896D85CB3435840" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Maturities of long term debt, year two</link:label>
    <link:label id="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_89AD9375212D46728896D85CB3435840_label_en-US" xlink:label="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_89AD9375212D46728896D85CB3435840" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt, Maturities, Repayments of Principal in Year Two</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_89AD9375212D46728896D85CB3435840" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_89AD9375212D46728896D85CB3435840" xlink:to="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_89AD9375212D46728896D85CB3435840" xlink:type="arc" />
    <link:label id="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_DE5686CC7F27622FCFB8D85CB3436534_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_DE5686CC7F27622FCFB8D85CB3436534" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Maturities of long term debt, year three</link:label>
    <link:label id="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_DE5686CC7F27622FCFB8D85CB3436534_label_en-US" xlink:label="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_DE5686CC7F27622FCFB8D85CB3436534" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt, Maturities, Repayments of Principal in Year Three</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_DE5686CC7F27622FCFB8D85CB3436534" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_DE5686CC7F27622FCFB8D85CB3436534" xlink:to="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_DE5686CC7F27622FCFB8D85CB3436534" xlink:type="arc" />
    <link:label id="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_5E120BD1A3DA1F320FD7D85CB343A899_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_5E120BD1A3DA1F320FD7D85CB343A899" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Maturities of long term debt, year four</link:label>
    <link:label id="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_5E120BD1A3DA1F320FD7D85CB343A899_label_en-US" xlink:label="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_5E120BD1A3DA1F320FD7D85CB343A899" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt, Maturities, Repayments of Principal in Year Four</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_5E120BD1A3DA1F320FD7D85CB343A899" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_5E120BD1A3DA1F320FD7D85CB343A899" xlink:to="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_5E120BD1A3DA1F320FD7D85CB343A899" xlink:type="arc" />
    <link:label id="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive_820A29193D69C6E7C921D85CB3431B8A_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive_820A29193D69C6E7C921D85CB3431B8A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Maturities of long term debt, year five</link:label>
    <link:label id="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive_820A29193D69C6E7C921D85CB3431B8A_label_en-US" xlink:label="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive_820A29193D69C6E7C921D85CB3431B8A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt, Maturities, Repayments of Principal in Year Five</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive_820A29193D69C6E7C921D85CB3431B8A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive_820A29193D69C6E7C921D85CB3431B8A" xlink:to="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive_820A29193D69C6E7C921D85CB3431B8A" xlink:type="arc" />
    <link:label id="lab_us-gaap_InterestPaidNet_FC6E4241E5E27D2195D4D85CB343D188_terseLabel_en-US" xlink:label="lab_us-gaap_InterestPaidNet_FC6E4241E5E27D2195D4D85CB343D188" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Interest paid</link:label>
    <link:label id="lab_us-gaap_InterestPaidNet_FC6E4241E5E27D2195D4D85CB343D188_label_en-US" xlink:label="lab_us-gaap_InterestPaidNet_FC6E4241E5E27D2195D4D85CB343D188" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest Paid, Net</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_InterestPaidNet" xlink:label="loc_us-gaap_InterestPaidNet_FC6E4241E5E27D2195D4D85CB343D188" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InterestPaidNet_FC6E4241E5E27D2195D4D85CB343D188" xlink:to="lab_us-gaap_InterestPaidNet_FC6E4241E5E27D2195D4D85CB343D188" xlink:type="arc" />
    <link:label id="lab_ctas_CommercialPaperMaximumBorrowingCapacity_F82FE22F80CC7510A51AD85CB34423FF_terseLabel_en-US" xlink:label="lab_ctas_CommercialPaperMaximumBorrowingCapacity_F82FE22F80CC7510A51AD85CB34423FF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Commercial paper program availability</link:label>
    <link:label id="lab_ctas_CommercialPaperMaximumBorrowingCapacity_F82FE22F80CC7510A51AD85CB34423FF_label_en-US" xlink:label="lab_ctas_CommercialPaperMaximumBorrowingCapacity_F82FE22F80CC7510A51AD85CB34423FF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Commercial Paper Maximum Borrowing Capacity</link:label>
    <link:label id="lab_ctas_CommercialPaperMaximumBorrowingCapacity_F82FE22F80CC7510A51AD85CB34423FF_documentation_en-US" xlink:label="lab_ctas_CommercialPaperMaximumBorrowingCapacity_F82FE22F80CC7510A51AD85CB34423FF" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This element represents the maximum borrowing capacity under a commercial paper program.</link:label>
    <link:loc xlink:href="ctas-20120531.xsd#ctas_CommercialPaperMaximumBorrowingCapacity" xlink:label="loc_ctas_CommercialPaperMaximumBorrowingCapacity_F82FE22F80CC7510A51AD85CB34423FF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctas_CommercialPaperMaximumBorrowingCapacity_F82FE22F80CC7510A51AD85CB34423FF" xlink:to="lab_ctas_CommercialPaperMaximumBorrowingCapacity_F82FE22F80CC7510A51AD85CB34423FF" xlink:type="arc" />
    <link:label id="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_2851B1EE5FA0ED5A9F81D85CB3443EA2_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_2851B1EE5FA0ED5A9F81D85CB3443EA2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Revolving credit facility, maximum borrowing capacity with accordion feature</link:label>
    <link:label id="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_2851B1EE5FA0ED5A9F81D85CB3443EA2_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_2851B1EE5FA0ED5A9F81D85CB3443EA2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Maximum Borrowing Capacity</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_2851B1EE5FA0ED5A9F81D85CB3443EA2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_2851B1EE5FA0ED5A9F81D85CB3443EA2" xlink:to="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_2851B1EE5FA0ED5A9F81D85CB3443EA2" xlink:type="arc" />
    <link:label id="lab_ctas_DebtToEbitdaRatio_1A1E1E82A20539C2D913D85CB3449E73_terseLabel_en-US" xlink:label="lab_ctas_DebtToEbitdaRatio_1A1E1E82A20539C2D913D85CB3449E73" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt to EBITDA Ratio Covenant Requirement</link:label>
    <link:label id="lab_ctas_DebtToEbitdaRatio_1A1E1E82A20539C2D913D85CB3449E73_label_en-US" xlink:label="lab_ctas_DebtToEbitdaRatio_1A1E1E82A20539C2D913D85CB3449E73" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt to EBITDA Ratio</link:label>
    <link:label id="lab_ctas_DebtToEbitdaRatio_1A1E1E82A20539C2D913D85CB3449E73_documentation_en-US" xlink:label="lab_ctas_DebtToEbitdaRatio_1A1E1E82A20539C2D913D85CB3449E73" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Debt to EBITDA Ratio</link:label>
    <link:loc xlink:href="ctas-20120531.xsd#ctas_DebtToEbitdaRatio" xlink:label="loc_ctas_DebtToEbitdaRatio_1A1E1E82A20539C2D913D85CB3449E73" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctas_DebtToEbitdaRatio_1A1E1E82A20539C2D913D85CB3449E73" xlink:to="lab_ctas_DebtToEbitdaRatio_1A1E1E82A20539C2D913D85CB3449E73" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentFaceAmount_0599095263942F80BFDDD85CB344E8D0_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentFaceAmount_0599095263942F80BFDDD85CB344E8D0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Instrument, Face Amount</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentFaceAmount_0599095263942F80BFDDD85CB344E8D0_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentFaceAmount_0599095263942F80BFDDD85CB344E8D0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Face Amount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_DebtInstrumentFaceAmount" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_0599095263942F80BFDDD85CB344E8D0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentFaceAmount_0599095263942F80BFDDD85CB344E8D0" xlink:to="lab_us-gaap_DebtInstrumentFaceAmount_0599095263942F80BFDDD85CB344E8D0" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_1CA98DD998AD5F2B554FD85CB344ABA5_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_1CA98DD998AD5F2B554FD85CB344ABA5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Stated interest rate percentage on long term debt</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_1CA98DD998AD5F2B554FD85CB344ABA5_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_1CA98DD998AD5F2B554FD85CB344ABA5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Interest Rate, Stated Percentage</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_1CA98DD998AD5F2B554FD85CB344ABA5" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ProceedsFromIssuanceOfLongTermDebt_F8331407B63A25008340D85CB344CF61_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromIssuanceOfLongTermDebt_F8331407B63A25008340D85CB344CF61" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from issuance of debt</link:label>
    <link:label id="lab_us-gaap_ProceedsFromIssuanceOfLongTermDebt_F8331407B63A25008340D85CB344CF61_label_en-US" xlink:label="lab_us-gaap_ProceedsFromIssuanceOfLongTermDebt_F8331407B63A25008340D85CB344CF61" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from Issuance of Long-term Debt</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ProceedsFromIssuanceOfLongTermDebt" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_F8331407B63A25008340D85CB344CF61" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_F8331407B63A25008340D85CB344CF61" xlink:to="lab_us-gaap_ProceedsFromIssuanceOfLongTermDebt_F8331407B63A25008340D85CB344CF61" xlink:type="arc" />
    <link:label id="lab_ctas_AmortizationOfInterestRateLockAgreements_B5A1B9D5099A09111A02D85CB3443CED_terseLabel_en-US" xlink:label="lab_ctas_AmortizationOfInterestRateLockAgreements_B5A1B9D5099A09111A02D85CB3443CED" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amortization of interest rate lock agreements</link:label>
    <link:label id="lab_ctas_AmortizationOfInterestRateLockAgreements_B5A1B9D5099A09111A02D85CB3443CED_label_en-US" xlink:label="lab_ctas_AmortizationOfInterestRateLockAgreements_B5A1B9D5099A09111A02D85CB3443CED" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Amortization of Interest Rate Lock Agreements</link:label>
    <link:label id="lab_ctas_AmortizationOfInterestRateLockAgreements_B5A1B9D5099A09111A02D85CB3443CED_documentation_en-US" xlink:label="lab_ctas_AmortizationOfInterestRateLockAgreements_B5A1B9D5099A09111A02D85CB3443CED" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the amount of amortization of interest rate lock agreements, the purpose of which is to hedge against movements in the treasury rates.</link:label>
    <link:loc xlink:href="ctas-20120531.xsd#ctas_AmortizationOfInterestRateLockAgreements" xlink:label="loc_ctas_AmortizationOfInterestRateLockAgreements_B5A1B9D5099A09111A02D85CB3443CED" xlink:type="locator" />
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    <link:label id="lab_us-gaap_RepaymentsOfLongTermDebt_147A1E4EFA15FC87220AD85CB344CB76_terseLabel_en-US" xlink:label="lab_us-gaap_RepaymentsOfLongTermDebt_147A1E4EFA15FC87220AD85CB344CB76" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Payments on long term debt</link:label>
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    <link:loc xlink:href="ctas-20120531.xsd#ctas_SerranoPurportedClassActionLawsuitMember" xlink:label="loc_ctas_SerranoPurportedClassActionLawsuitMember_2D3B1E8FBB340A1D6CD8D805355FB1E3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctas_SerranoPurportedClassActionLawsuitMember_2D3B1E8FBB340A1D6CD8D805355FB1E3" xlink:to="lab_ctas_SerranoPurportedClassActionLawsuitMember_2D3B1E8FBB340A1D6CD8D805355FB1E3" xlink:type="arc" />
    <link:label id="lab_ctas_VelizPurportedClassActionLawsuitMember_1E2A14CCC6DB259B4ECCD805355FD08F_terseLabel_en-US" xlink:label="lab_ctas_VelizPurportedClassActionLawsuitMember_1E2A14CCC6DB259B4ECCD805355FD08F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Veliz lawsuit [Member]</link:label>
    <link:label id="lab_ctas_VelizPurportedClassActionLawsuitMember_1E2A14CCC6DB259B4ECCD805355FD08F_label_en-US" xlink:label="lab_ctas_VelizPurportedClassActionLawsuitMember_1E2A14CCC6DB259B4ECCD805355FD08F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Veliz Purported Class Action Lawsuit [Member]</link:label>
    <link:label id="lab_ctas_VelizPurportedClassActionLawsuitMember_1E2A14CCC6DB259B4ECCD805355FD08F_documentation_en-US" xlink:label="lab_ctas_VelizPurportedClassActionLawsuitMember_1E2A14CCC6DB259B4ECCD805355FD08F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents purported class action lawsuit alleging violations of certain federal and state wage and hour laws applicable to its service sales representatives.</link:label>
    <link:loc xlink:href="ctas-20120531.xsd#ctas_VelizPurportedClassActionLawsuitMember" xlink:label="loc_ctas_VelizPurportedClassActionLawsuitMember_1E2A14CCC6DB259B4ECCD805355FD08F" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LossContingenciesLineItems_5D0F9B3F55D098ECFA54D805355F0961_terseLabel_en-US" xlink:label="lab_us-gaap_LossContingenciesLineItems_5D0F9B3F55D098ECFA54D805355F0961" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Litigation and Other Contingencies</link:label>
    <link:label id="lab_us-gaap_LossContingenciesLineItems_5D0F9B3F55D098ECFA54D805355F0961_label_en-US" xlink:label="lab_us-gaap_LossContingenciesLineItems_5D0F9B3F55D098ECFA54D805355F0961" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Loss Contingencies [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_LossContingenciesLineItems" xlink:label="loc_us-gaap_LossContingenciesLineItems_5D0F9B3F55D098ECFA54D805355F0961" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LossContingenciesLineItems_5D0F9B3F55D098ECFA54D805355F0961" xlink:to="lab_us-gaap_LossContingenciesLineItems_5D0F9B3F55D098ECFA54D805355F0961" xlink:type="arc" />
    <link:label id="lab_ctas_LossContingencyNumberOfPlaintiffs_2BCE410684DF59E23447D805355F0E7B_terseLabel_en-US" xlink:label="lab_ctas_LossContingencyNumberOfPlaintiffs_2BCE410684DF59E23447D805355F0E7B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of plaintiffs</link:label>
    <link:label id="lab_ctas_LossContingencyNumberOfPlaintiffs_2BCE410684DF59E23447D805355F0E7B_label_en-US" xlink:label="lab_ctas_LossContingencyNumberOfPlaintiffs_2BCE410684DF59E23447D805355F0E7B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Loss Contingency, Number of Plaintiffs</link:label>
    <link:label id="lab_ctas_LossContingencyNumberOfPlaintiffs_2BCE410684DF59E23447D805355F0E7B_documentation_en-US" xlink:label="lab_ctas_LossContingencyNumberOfPlaintiffs_2BCE410684DF59E23447D805355F0E7B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Loss Contingency, Number of Plaintiffs</link:label>
    <link:loc xlink:href="ctas-20120531.xsd#ctas_LossContingencyNumberOfPlaintiffs" xlink:label="loc_ctas_LossContingencyNumberOfPlaintiffs_2BCE410684DF59E23447D805355F0E7B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctas_LossContingencyNumberOfPlaintiffs_2BCE410684DF59E23447D805355F0E7B" xlink:to="lab_ctas_LossContingencyNumberOfPlaintiffs_2BCE410684DF59E23447D805355F0E7B" xlink:type="arc" />
    <link:label id="lab_us-gaap_LossContingencyAccrualCarryingValuePayments_1D40222A67B5BD4F3D51D805355F1D26_terseLabel_en-US" xlink:label="lab_us-gaap_LossContingencyAccrualCarryingValuePayments_1D40222A67B5BD4F3D51D805355F1D26" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Litigation settlement payments</link:label>
    <link:label id="lab_us-gaap_LossContingencyAccrualCarryingValuePayments_1D40222A67B5BD4F3D51D805355F1D26_label_en-US" xlink:label="lab_us-gaap_LossContingencyAccrualCarryingValuePayments_1D40222A67B5BD4F3D51D805355F1D26" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Loss Contingency Accrual, Carrying Value, Payments</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_LossContingencyAccrualCarryingValuePayments" xlink:label="loc_us-gaap_LossContingencyAccrualCarryingValuePayments_1D40222A67B5BD4F3D51D805355F1D26" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LossContingencyAccrualCarryingValuePayments_1D40222A67B5BD4F3D51D805355F1D26" xlink:to="lab_us-gaap_LossContingencyAccrualCarryingValuePayments_1D40222A67B5BD4F3D51D805355F1D26" xlink:type="arc" />
    <link:label id="lab_us-gaap_GainLossRelatedToLitigationSettlement_74793BA382910216E83DD805355F4968_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_GainLossRelatedToLitigationSettlement_74793BA382910216E83DD805355F4968" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Legal settlements expense</link:label>
    <link:label id="lab_us-gaap_GainLossRelatedToLitigationSettlement_74793BA382910216E83DD805355F4968_label_en-US" xlink:label="lab_us-gaap_GainLossRelatedToLitigationSettlement_74793BA382910216E83DD805355F4968" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Gain (Loss) Related to Litigation Settlement</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_GainLossRelatedToLitigationSettlement" xlink:label="loc_us-gaap_GainLossRelatedToLitigationSettlement_74793BA382910216E83DD805355F4968" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_GainLossRelatedToLitigationSettlement_74793BA382910216E83DD805355F4968" xlink:to="lab_us-gaap_GainLossRelatedToLitigationSettlement_74793BA382910216E83DD805355F4968" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock_A2AB5EF9F27BCF6F0BB02F3F934BDBC1_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock_A2AB5EF9F27BCF6F0BB02F3F934BDBC1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Information related to operating segments</link:label>
    <link:label id="lab_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock_A2AB5EF9F27BCF6F0BB02F3F934BDBC1_label_en-US" xlink:label="lab_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock_A2AB5EF9F27BCF6F0BB02F3F934BDBC1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Segment Reporting Information, by Segment [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock_A2AB5EF9F27BCF6F0BB02F3F934BDBC1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock_A2AB5EF9F27BCF6F0BB02F3F934BDBC1" xlink:to="lab_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock_A2AB5EF9F27BCF6F0BB02F3F934BDBC1" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsByMajorClassTable_76A351A72351E5599213CDDF33B4FF62_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsByMajorClassTable_76A351A72351E5599213CDDF33B4FF62" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Finite-Lived Intangible Assets by Major Class [Table]</link:label>
    <link:label id="lab_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsByMajorClassTable_76A351A72351E5599213CDDF33B4FF62_label_en-US" xlink:label="lab_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsByMajorClassTable_76A351A72351E5599213CDDF33B4FF62" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Finite-Lived Intangible Assets by Major Class [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsByMajorClassTable" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsByMajorClassTable_76A351A72351E5599213CDDF33B4FF62" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsByMajorClassTable_76A351A72351E5599213CDDF33B4FF62" xlink:to="lab_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsByMajorClassTable_76A351A72351E5599213CDDF33B4FF62" xlink:type="arc" />
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsLineItems_30C0BACC99A1D9169666CDDF33B53879_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsLineItems_30C0BACC99A1D9169666CDDF33B53879" 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_FiniteLivedIntangibleAssetsLineItems_30C0BACC99A1D9169666CDDF33B53879_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsLineItems_30C0BACC99A1D9169666CDDF33B53879" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Assets [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_30C0BACC99A1D9169666CDDF33B53879" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_30C0BACC99A1D9169666CDDF33B53879" xlink:to="lab_us-gaap_FiniteLivedIntangibleAssetsLineItems_30C0BACC99A1D9169666CDDF33B53879" xlink:type="arc" />
    <link:label id="lab_ctas_FiniteLivedIntangibleAssetsNetRollForward_C9AFEDEE2EE52CDC8491CDDF33B5DAD3_terseLabel_en-US" xlink:label="lab_ctas_FiniteLivedIntangibleAssetsNetRollForward_C9AFEDEE2EE52CDC8491CDDF33B5DAD3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Service contracts [Roll Forward]</link:label>
    <link:label id="lab_ctas_FiniteLivedIntangibleAssetsNetRollForward_C9AFEDEE2EE52CDC8491CDDF33B5DAD3_label_en-US" xlink:label="lab_ctas_FiniteLivedIntangibleAssetsNetRollForward_C9AFEDEE2EE52CDC8491CDDF33B5DAD3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finite Lived Intangible Assets, Net [Roll Forward]</link:label>
    <link:label id="lab_ctas_FiniteLivedIntangibleAssetsNetRollForward_C9AFEDEE2EE52CDC8491CDDF33B5DAD3_documentation_en-US" xlink:label="lab_ctas_FiniteLivedIntangibleAssetsNetRollForward_C9AFEDEE2EE52CDC8491CDDF33B5DAD3" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US" />
    <link:loc xlink:href="ctas-20120531.xsd#ctas_FiniteLivedIntangibleAssetsNetRollForward" xlink:label="loc_ctas_FiniteLivedIntangibleAssetsNetRollForward_C9AFEDEE2EE52CDC8491CDDF33B5DAD3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctas_FiniteLivedIntangibleAssetsNetRollForward_C9AFEDEE2EE52CDC8491CDDF33B5DAD3" xlink:to="lab_ctas_FiniteLivedIntangibleAssetsNetRollForward_C9AFEDEE2EE52CDC8491CDDF33B5DAD3" xlink:type="arc" />
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsNet_46F7E41C99EFC747C0A4CDDF33B595CB_periodStartLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsNet_46F7E41C99EFC747C0A4CDDF33B595CB" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Balance at the beginning of the period</link:label>
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsNet_46F7E41C99EFC747C0A4CDDF33B595CB_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsNet_46F7E41C99EFC747C0A4CDDF33B595CB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Assets, Net</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_46F7E41C99EFC747C0A4CDDF33B595CB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_46F7E41C99EFC747C0A4CDDF33B595CB" xlink:to="lab_us-gaap_FiniteLivedIntangibleAssetsNet_46F7E41C99EFC747C0A4CDDF33B595CB" xlink:type="arc" />
    <link:label id="lab_us-gaap_AcquiredFiniteLivedIntangibleAssetAmount_6C1C9D35E7A866DAA4ACCDDF33B5E6DF_terseLabel_en-US" xlink:label="lab_us-gaap_AcquiredFiniteLivedIntangibleAssetAmount_6C1C9D35E7A866DAA4ACCDDF33B5E6DF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Service contracts acquired</link:label>
    <link:label id="lab_us-gaap_AcquiredFiniteLivedIntangibleAssetAmount_6C1C9D35E7A866DAA4ACCDDF33B5E6DF_label_en-US" xlink:label="lab_us-gaap_AcquiredFiniteLivedIntangibleAssetAmount_6C1C9D35E7A866DAA4ACCDDF33B5E6DF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Acquired Finite-lived Intangible Asset, Amount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetAmount" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetAmount_6C1C9D35E7A866DAA4ACCDDF33B5E6DF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetAmount_6C1C9D35E7A866DAA4ACCDDF33B5E6DF" xlink:to="lab_us-gaap_AcquiredFiniteLivedIntangibleAssetAmount_6C1C9D35E7A866DAA4ACCDDF33B5E6DF" xlink:type="arc" />
    <link:label id="lab_ctas_FiniteLivedIntangibleAssetsAmortization_989DADA0625E9D74EE6FCDDF33B53AED_negatedLabel_en-US" xlink:label="lab_ctas_FiniteLivedIntangibleAssetsAmortization_989DADA0625E9D74EE6FCDDF33B53AED" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Service contracts amortization</link:label>
    <link:label id="lab_ctas_FiniteLivedIntangibleAssetsAmortization_989DADA0625E9D74EE6FCDDF33B53AED_label_en-US" xlink:label="lab_ctas_FiniteLivedIntangibleAssetsAmortization_989DADA0625E9D74EE6FCDDF33B53AED" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finite Lived Intangible Assets Amortization</link:label>
    <link:label id="lab_ctas_FiniteLivedIntangibleAssetsAmortization_989DADA0625E9D74EE6FCDDF33B53AED_documentation_en-US" xlink:label="lab_ctas_FiniteLivedIntangibleAssetsAmortization_989DADA0625E9D74EE6FCDDF33B53AED" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Amount of reduction of finite-lived intangible assets due to amortization during the period.</link:label>
    <link:loc xlink:href="ctas-20120531.xsd#ctas_FiniteLivedIntangibleAssetsAmortization" xlink:label="loc_ctas_FiniteLivedIntangibleAssetsAmortization_989DADA0625E9D74EE6FCDDF33B53AED" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctas_FiniteLivedIntangibleAssetsAmortization_989DADA0625E9D74EE6FCDDF33B53AED" xlink:to="lab_ctas_FiniteLivedIntangibleAssetsAmortization_989DADA0625E9D74EE6FCDDF33B53AED" xlink:type="arc" />
    <link:label id="lab_ctas_FiniteLivedIntangibleAssetsTranslationAdjustments_01DE139A844139449666CDDF33B5A57A_terseLabel_en-US" xlink:label="lab_ctas_FiniteLivedIntangibleAssetsTranslationAdjustments_01DE139A844139449666CDDF33B5A57A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Foreign currency translation</link:label>
    <link:label id="lab_ctas_FiniteLivedIntangibleAssetsTranslationAdjustments_01DE139A844139449666CDDF33B5A57A_label_en-US" xlink:label="lab_ctas_FiniteLivedIntangibleAssetsTranslationAdjustments_01DE139A844139449666CDDF33B5A57A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finite Lived Intangible Assets, Translation Adjustments</link:label>
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    <link:label id="lab_ctas_OrganizationConsolidationAndSignificantAccountingPoliciesTextBlock_D409BE987B44A65AD41C4980726D09E0_label_en-US" xlink:label="lab_ctas_OrganizationConsolidationAndSignificantAccountingPoliciesTextBlock_D409BE987B44A65AD41C4980726D09E0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Organization, Consolidation and Significant Accounting Policies [Text Block]</link:label>
    <link:label id="lab_ctas_OrganizationConsolidationAndSignificantAccountingPoliciesTextBlock_D409BE987B44A65AD41C4980726D09E0_documentation_en-US" xlink:label="lab_ctas_OrganizationConsolidationAndSignificantAccountingPoliciesTextBlock_D409BE987B44A65AD41C4980726D09E0" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This element encapsulates description containing the entire organization, consolidation, basis of presentation of financial statements and disclosures pertaining to significant accounting policies.</link:label>
    <link:loc xlink:href="ctas-20120531.xsd#ctas_OrganizationConsolidationAndSignificantAccountingPoliciesTextBlock" xlink:label="loc_ctas_OrganizationConsolidationAndSignificantAccountingPoliciesTextBlock_D409BE987B44A65AD41C4980726D09E0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctas_OrganizationConsolidationAndSignificantAccountingPoliciesTextBlock_D409BE987B44A65AD41C4980726D09E0" xlink:to="lab_ctas_OrganizationConsolidationAndSignificantAccountingPoliciesTextBlock_D409BE987B44A65AD41C4980726D09E0" xlink:type="arc" />
    <link:label id="lab_ctas_ScheduleOfOtherAssetsTable_C59F40CEBB5409FCD5ABCAA1DCA980BB_terseLabel_en-US" xlink:label="lab_ctas_ScheduleOfOtherAssetsTable_C59F40CEBB5409FCD5ABCAA1DCA980BB" 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_C59F40CEBB5409FCD5ABCAA1DCA980BB_label_en-US" xlink:label="lab_ctas_ScheduleOfOtherAssetsTable_C59F40CEBB5409FCD5ABCAA1DCA980BB" 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_C59F40CEBB5409FCD5ABCAA1DCA980BB_documentation_en-US" xlink:label="lab_ctas_ScheduleOfOtherAssetsTable_C59F40CEBB5409FCD5ABCAA1DCA980BB" 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-20120531.xsd#ctas_ScheduleOfOtherAssetsTable" xlink:label="loc_ctas_ScheduleOfOtherAssetsTable_C59F40CEBB5409FCD5ABCAA1DCA980BB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctas_ScheduleOfOtherAssetsTable_C59F40CEBB5409FCD5ABCAA1DCA980BB" xlink:to="lab_ctas_ScheduleOfOtherAssetsTable_C59F40CEBB5409FCD5ABCAA1DCA980BB" xlink:type="arc" />
    <link:label id="lab_us-gaap_ServiceAgreementsMember_EC61B23A96257F55144CCAA1DCA99B41_terseLabel_en-US" xlink:label="lab_us-gaap_ServiceAgreementsMember_EC61B23A96257F55144CCAA1DCA99B41" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Service Contracts [Member]</link:label>
    <link:label id="lab_us-gaap_ServiceAgreementsMember_EC61B23A96257F55144CCAA1DCA99B41_label_en-US" xlink:label="lab_us-gaap_ServiceAgreementsMember_EC61B23A96257F55144CCAA1DCA99B41" 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/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_ServiceAgreementsMember" xlink:label="loc_us-gaap_ServiceAgreementsMember_EC61B23A96257F55144CCAA1DCA99B41" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ServiceAgreementsMember_EC61B23A96257F55144CCAA1DCA99B41" xlink:to="lab_us-gaap_ServiceAgreementsMember_EC61B23A96257F55144CCAA1DCA99B41" xlink:type="arc" />
    <link:label id="lab_ctas_OtherAssetsAxis_FCCC082DC59845D3872ACAA1DCA911C3_terseLabel_en-US" xlink:label="lab_ctas_OtherAssetsAxis_FCCC082DC59845D3872ACAA1DCA911C3" 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_FCCC082DC59845D3872ACAA1DCA911C3_label_en-US" xlink:label="lab_ctas_OtherAssetsAxis_FCCC082DC59845D3872ACAA1DCA911C3" 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_FCCC082DC59845D3872ACAA1DCA911C3_documentation_en-US" xlink:label="lab_ctas_OtherAssetsAxis_FCCC082DC59845D3872ACAA1DCA911C3" 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-20120531.xsd#ctas_OtherAssetsAxis" xlink:label="loc_ctas_OtherAssetsAxis_FCCC082DC59845D3872ACAA1DCA911C3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctas_OtherAssetsAxis_FCCC082DC59845D3872ACAA1DCA911C3" xlink:to="lab_ctas_OtherAssetsAxis_FCCC082DC59845D3872ACAA1DCA911C3" xlink:type="arc" />
    <link:label id="lab_ctas_OtherAssetsDomain_2AC34817518F69A96D13CAA1DCAA3EE4_terseLabel_en-US" xlink:label="lab_ctas_OtherAssetsDomain_2AC34817518F69A96D13CAA1DCAA3EE4" 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_2AC34817518F69A96D13CAA1DCAA3EE4_label_en-US" xlink:label="lab_ctas_OtherAssetsDomain_2AC34817518F69A96D13CAA1DCAA3EE4" 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_2AC34817518F69A96D13CAA1DCAA3EE4_documentation_en-US" xlink:label="lab_ctas_OtherAssetsDomain_2AC34817518F69A96D13CAA1DCAA3EE4" 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-20120531.xsd#ctas_OtherAssetsDomain" xlink:label="loc_ctas_OtherAssetsDomain_2AC34817518F69A96D13CAA1DCAA3EE4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctas_OtherAssetsDomain_2AC34817518F69A96D13CAA1DCAA3EE4" xlink:to="lab_ctas_OtherAssetsDomain_2AC34817518F69A96D13CAA1DCAA3EE4" xlink:type="arc" />
    <link:label id="lab_us-gaap_NoncompeteAgreementsMember_75C3F58501B878DEB42ACAA1DCAA7315_terseLabel_en-US" xlink:label="lab_us-gaap_NoncompeteAgreementsMember_75C3F58501B878DEB42ACAA1DCAA7315" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Noncompete agreements [Member]</link:label>
    <link:label id="lab_us-gaap_NoncompeteAgreementsMember_75C3F58501B878DEB42ACAA1DCAA7315_label_en-US" xlink:label="lab_us-gaap_NoncompeteAgreementsMember_75C3F58501B878DEB42ACAA1DCAA7315" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Noncompete Agreements [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_NoncompeteAgreementsMember" xlink:label="loc_us-gaap_NoncompeteAgreementsMember_75C3F58501B878DEB42ACAA1DCAA7315" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NoncompeteAgreementsMember_75C3F58501B878DEB42ACAA1DCAA7315" xlink:to="lab_us-gaap_NoncompeteAgreementsMember_75C3F58501B878DEB42ACAA1DCAA7315" xlink:type="arc" />
    <link:label id="lab_us-gaap_InvestmentsMember_B8E0D495AD8E36A1F8CFCAA1DCAAE2E4_terseLabel_en-US" xlink:label="lab_us-gaap_InvestmentsMember_B8E0D495AD8E36A1F8CFCAA1DCAAE2E4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Investments [Member]</link:label>
    <link:label id="lab_us-gaap_InvestmentsMember_B8E0D495AD8E36A1F8CFCAA1DCAAE2E4_label_en-US" xlink:label="lab_us-gaap_InvestmentsMember_B8E0D495AD8E36A1F8CFCAA1DCAAE2E4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Investments [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_InvestmentsMember" xlink:label="loc_us-gaap_InvestmentsMember_B8E0D495AD8E36A1F8CFCAA1DCAAE2E4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InvestmentsMember_B8E0D495AD8E36A1F8CFCAA1DCAAE2E4" xlink:to="lab_us-gaap_InvestmentsMember_B8E0D495AD8E36A1F8CFCAA1DCAAE2E4" xlink:type="arc" />
    <link:label id="lab_ctas_OtherMiscellaneousAssetsMember_D877F4C8681BBD8F76B6CAA1DCAB1201_terseLabel_en-US" xlink:label="lab_ctas_OtherMiscellaneousAssetsMember_D877F4C8681BBD8F76B6CAA1DCAB1201" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other [Member]</link:label>
    <link:label id="lab_ctas_OtherMiscellaneousAssetsMember_D877F4C8681BBD8F76B6CAA1DCAB1201_label_en-US" xlink:label="lab_ctas_OtherMiscellaneousAssetsMember_D877F4C8681BBD8F76B6CAA1DCAB1201" 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_D877F4C8681BBD8F76B6CAA1DCAB1201_documentation_en-US" xlink:label="lab_ctas_OtherMiscellaneousAssetsMember_D877F4C8681BBD8F76B6CAA1DCAB1201" 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-20120531.xsd#ctas_OtherMiscellaneousAssetsMember" xlink:label="loc_ctas_OtherMiscellaneousAssetsMember_D877F4C8681BBD8F76B6CAA1DCAB1201" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctas_OtherMiscellaneousAssetsMember_D877F4C8681BBD8F76B6CAA1DCAB1201" xlink:to="lab_ctas_OtherMiscellaneousAssetsMember_D877F4C8681BBD8F76B6CAA1DCAB1201" xlink:type="arc" />
    <link:label id="lab_ctas_OtherAssetsLineItems_220228F86CCFE713B315CAA1DCAB7B4F_terseLabel_en-US" xlink:label="lab_ctas_OtherAssetsLineItems_220228F86CCFE713B315CAA1DCAB7B4F" 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>
    <link:label id="lab_ctas_OtherAssetsLineItems_220228F86CCFE713B315CAA1DCAB7B4F_label_en-US" xlink:label="lab_ctas_OtherAssetsLineItems_220228F86CCFE713B315CAA1DCAB7B4F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Assets [Line Items]</link:label>
    <link:label id="lab_ctas_OtherAssetsLineItems_220228F86CCFE713B315CAA1DCAB7B4F_documentation_en-US" xlink:label="lab_ctas_OtherAssetsLineItems_220228F86CCFE713B315CAA1DCAB7B4F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US" />
    <link:loc xlink:href="ctas-20120531.xsd#ctas_OtherAssetsLineItems" xlink:label="loc_ctas_OtherAssetsLineItems_220228F86CCFE713B315CAA1DCAB7B4F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctas_OtherAssetsLineItems_220228F86CCFE713B315CAA1DCAB7B4F" xlink:to="lab_ctas_OtherAssetsLineItems_220228F86CCFE713B315CAA1DCAB7B4F" xlink:type="arc" />
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsGross_B1EF2748BAF2C00F438FCAA1DCAB3B7F_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsGross_B1EF2748BAF2C00F438FCAA1DCAB3B7F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Service contracts, Carrying Amount</link:label>
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsGross_B1EF2748BAF2C00F438FCAA1DCAB3B7F_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsGross_B1EF2748BAF2C00F438FCAA1DCAB3B7F" 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/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsGross" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_B1EF2748BAF2C00F438FCAA1DCAB3B7F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsGross_B1EF2748BAF2C00F438FCAA1DCAB3B7F" xlink:to="lab_us-gaap_FiniteLivedIntangibleAssetsGross_B1EF2748BAF2C00F438FCAA1DCAB3B7F" xlink:type="arc" />
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_A70C4200700B70905BA7CAA1DCAB2458_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_A70C4200700B70905BA7CAA1DCAB2458" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Service contracts, Accumulated Amortization</link:label>
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_A70C4200700B70905BA7CAA1DCAB2458_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_A70C4200700B70905BA7CAA1DCAB2458" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Assets, Accumulated Amortization</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_A70C4200700B70905BA7CAA1DCAB2458" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_A70C4200700B70905BA7CAA1DCAB2458" xlink:to="lab_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_A70C4200700B70905BA7CAA1DCAB2458" xlink:type="arc" />
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsNet_AC977861398CFD2706AECAA1DCABB097_totalLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsNet_AC977861398CFD2706AECAA1DCABB097" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Service contracts, Net</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_AC977861398CFD2706AECAA1DCABB097" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_AC977861398CFD2706AECAA1DCABB097" xlink:to="lab_us-gaap_FiniteLivedIntangibleAssetsNet_AC977861398CFD2706AECAA1DCABB097" xlink:type="arc" />
    <link:label id="lab_ctas_OtherAssetsGross_9786C516B1B211B190C7CAA1DCAB21C3_terseLabel_en-US" xlink:label="lab_ctas_OtherAssetsGross_9786C516B1B211B190C7CAA1DCAB21C3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other Assets, Carrying Amount</link:label>
    <link:label id="lab_ctas_OtherAssetsGross_9786C516B1B211B190C7CAA1DCAB21C3_label_en-US" xlink:label="lab_ctas_OtherAssetsGross_9786C516B1B211B190C7CAA1DCAB21C3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Assets, Gross</link:label>
    <link:label id="lab_ctas_OtherAssetsGross_9786C516B1B211B190C7CAA1DCAB21C3_documentation_en-US" xlink:label="lab_ctas_OtherAssetsGross_9786C516B1B211B190C7CAA1DCAB21C3" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This element represents the gross carrying amount, as of the balance sheet date, of finite-lived assets and other noncurrent assets.</link:label>
    <link:loc xlink:href="ctas-20120531.xsd#ctas_OtherAssetsGross" xlink:label="loc_ctas_OtherAssetsGross_9786C516B1B211B190C7CAA1DCAB21C3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctas_OtherAssetsGross_9786C516B1B211B190C7CAA1DCAB21C3" xlink:to="lab_ctas_OtherAssetsGross_9786C516B1B211B190C7CAA1DCAB21C3" xlink:type="arc" />
    <link:label id="lab_ctas_AccumulatedAmortizationOfOtherAssets_52B45CBA14939E5510BDCAA1DCABBB15_terseLabel_en-US" xlink:label="lab_ctas_AccumulatedAmortizationOfOtherAssets_52B45CBA14939E5510BDCAA1DCABBB15" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other Assets, Accumulated Amortization</link:label>
    <link:label id="lab_ctas_AccumulatedAmortizationOfOtherAssets_52B45CBA14939E5510BDCAA1DCABBB15_label_en-US" xlink:label="lab_ctas_AccumulatedAmortizationOfOtherAssets_52B45CBA14939E5510BDCAA1DCABBB15" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accumulated Amortization of Other Assets</link:label>
    <link:label id="lab_ctas_AccumulatedAmortizationOfOtherAssets_52B45CBA14939E5510BDCAA1DCABBB15_documentation_en-US" xlink:label="lab_ctas_AccumulatedAmortizationOfOtherAssets_52B45CBA14939E5510BDCAA1DCABBB15" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This element represents the accumulated amortization of finite-lived assets and other noncurrent assets.</link:label>
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    <link:label id="lab_us-gaap_CommonStockDividendsPerShareDeclared_3B17D928A27125CCE71DCA08F268CB21_terseLabel_en-US" xlink:label="lab_us-gaap_CommonStockDividendsPerShareDeclared_3B17D928A27125CCE71DCA08F268CB21" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Dividends declared and paid per share (in dollars per share)</link:label>
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    <link:label id="lab_us-gaap_AccountsReceivableNetCurrent_4A228AA5092BC15FFD78CDDEEAA5F40F_terseLabel_en-US" xlink:label="lab_us-gaap_AccountsReceivableNetCurrent_4A228AA5092BC15FFD78CDDEEAA5F40F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accounts receivable, principally trade, less allowance of $17,017 abd $17,507, respectively</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_DeferredTaxLiabilitiesCurrent" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesCurrent_3E92BDF760DDB0EA3D10CDDEEAA6ED99" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_LiabilitiesCurrent" xlink:label="loc_us-gaap_LiabilitiesCurrent_72A43427054F4C06A167CDDEEAA617DA" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_LiabilitiesNoncurrent" xlink:label="loc_us-gaap_LiabilitiesNoncurrent_8340AB9E53C3E5AE43B2CDDEEAA687AA" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PreferredStockValue_45B0A9B4FF0460353D10CDDEEAA64BFE_label_en-US" xlink:label="lab_us-gaap_PreferredStockValue_45B0A9B4FF0460353D10CDDEEAA64BFE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Preferred Stock, Value, Issued</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_PreferredStockValue" xlink:label="loc_us-gaap_PreferredStockValue_45B0A9B4FF0460353D10CDDEEAA64BFE" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ScheduleOfDebtTableTextBlock_043B28BFC1BD23F9D87F5947635A05E3_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfDebtTableTextBlock_043B28BFC1BD23F9D87F5947635A05E3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Debt</link:label>
    <link:label id="lab_us-gaap_ScheduleOfDebtTableTextBlock_043B28BFC1BD23F9D87F5947635A05E3_label_en-US" xlink:label="lab_us-gaap_ScheduleOfDebtTableTextBlock_043B28BFC1BD23F9D87F5947635A05E3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Debt [Table Text Block]</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" xlink:label="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_54EA6DF6B9B22FC504AED805353997EC" xlink:type="locator" />
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    <link:label id="lab_us-gaap_IncreaseDecreaseInAccountsPayable_20BEC4693481A4056EE7D80535395D68_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsPayable_20BEC4693481A4056EE7D80535395D68" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accounts payable</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayable_20BEC4693481A4056EE7D80535395D68" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities_7D6A498754FCB4FBCE86D8053539A539" xlink:type="locator" />
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    <link:label id="lab_us-gaap_IncreaseDecreaseInAccruedLiabilities_551F6B5CEE860DEC5416D805353AB510_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccruedLiabilities_551F6B5CEE860DEC5416D805353AB510" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accrued liabilities</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInAccruedLiabilities_551F6B5CEE860DEC5416D805353AB510_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccruedLiabilities_551F6B5CEE860DEC5416D805353AB510" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Accrued Liabilities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_IncreaseDecreaseInAccruedLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedLiabilities_551F6B5CEE860DEC5416D805353AB510" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInAccruedLiabilities_551F6B5CEE860DEC5416D805353AB510" xlink:to="lab_us-gaap_IncreaseDecreaseInAccruedLiabilities_551F6B5CEE860DEC5416D805353AB510" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable_C87413A7612FFB45CA46D805353AC8F0_verboseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable_C87413A7612FFB45CA46D805353AC8F0" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Income taxes, current</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable_C87413A7612FFB45CA46D805353AC8F0_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable_C87413A7612FFB45CA46D805353AC8F0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Income Taxes Payable, Net of Income Taxes Receivable</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable" xlink:label="loc_us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable_C87413A7612FFB45CA46D805353AC8F0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable_C87413A7612FFB45CA46D805353AC8F0" xlink:to="lab_us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable_C87413A7612FFB45CA46D805353AC8F0" xlink:type="arc" />
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_08BB7A67FEC8F9FDB43DD805353A1BE3_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_08BB7A67FEC8F9FDB43DD805353A1BE3" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash provided by operating activities</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_08BB7A67FEC8F9FDB43DD805353A1BE3_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_08BB7A67FEC8F9FDB43DD805353A1BE3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Operating Activities, Continuing Operations</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_08BB7A67FEC8F9FDB43DD805353A1BE3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_08BB7A67FEC8F9FDB43DD805353A1BE3" xlink:to="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_08BB7A67FEC8F9FDB43DD805353A1BE3" xlink:type="arc" />
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract_1161A518F3E5E09AEA00D805353A3C81_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract_1161A518F3E5E09AEA00D805353A3C81" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash flows from investing activities:</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract_1161A518F3E5E09AEA00D805353A3C81_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract_1161A518F3E5E09AEA00D805353A3C81" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract_1161A518F3E5E09AEA00D805353A3C81" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_360C61B49BA39FF4C346D805353AFF0D_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_360C61B49BA39FF4C346D805353AFF0D" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Capital expenditures</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_360C61B49BA39FF4C346D805353AFF0D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_360C61B49BA39FF4C346D805353AFF0D" xlink:to="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_360C61B49BA39FF4C346D805353AFF0D" xlink:type="arc" />
    <link:label id="lab_us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities_EA3F6A63DC849308C5D1D805353A162B_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities_EA3F6A63DC849308C5D1D805353A162B" 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:label id="lab_us-gaap_PaymentsToAcquireInvestments_547D78823CAA90BB3851D805353A518F_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireInvestments_547D78823CAA90BB3851D805353A518F" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Purchase of marketable securities and investments</link:label>
    <link:label id="lab_us-gaap_PaymentsToAcquireInvestments_547D78823CAA90BB3851D805353A518F_label_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireInvestments_547D78823CAA90BB3851D805353A518F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments to Acquire Investments</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2011/elts/us-gaap-2011-01-31.xsd#us-gaap_PaymentsToAcquireInvestments" xlink:label="loc_us-gaap_PaymentsToAcquireInvestments_547D78823CAA90BB3851D805353A518F" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_74BD7A7DFCDF3F4517FBD805353A46EC_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_74BD7A7DFCDF3F4517FBD805353A46EC" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Other</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_EF2F859FBC7CF07E530DD805353ABC50_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_EF2F859FBC7CF07E530DD805353ABC50" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Investing Activities, Continuing Operations</link:label>
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