Exhibit 32.1

Certification of Chief Executive Officer Pursuant to 18 U.S.C. § 1350,

as Adopted Pursuant to § 906 of the Sarbanes-Oxley Act of 2002

In connection with the filing with the Securities and Exchange Commission of the Report of Cintas Corporation (the “Company”) on Form 10-K for the period ending May 31, 2007 (the “Report”), I, Scott D. Farmer, certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that to the best of my knowledge:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ Scott D. Farmer                   

      Scott D. Farmer

      Principal Executive Officer

      July 30, 2007