Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report of Citrix Systems, Inc. (the “Company”) on Form 10-K for the period ending December 31, 2004 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), we, Mark B. Templeton, Chief Executive Officer of the Company, and David J. Henshall, Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to our knowledge, that:

(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/    MARK B. TEMPLETON        

Mark B. Templeton

Chief Executive Officer

/S/    DAVID J. HENSHALL        

David J. Henshall

Chief Financial Officer

March 11, 2005