EXHIBIT 23.1 CONSENT OF INDEPENDENT CERTIFIED PUBLIC ACCOUNTANTS We consent to the incorporation by reference in the Registration Statement (Form S-8 No. 333-61520) pertaining to the Amended and Restated 1995 Stock Plan and the 2000 Director and Officer Stock Option and Incentive Plan, the Registration Statement (Form S-8 No. 333-80201) pertaining to the Amended and Restated 1995 Stock Plan, the Second Amended and Restated 1995 Non-Employee Director Stock Option Plan and the Second Amended and Restated 1995 Employee Stock Purchase Plan and the Registration Statement (Form S-8 No. 333-2030) pertaining to the 1989 Stock Option Plan of Citrix Systems, Inc. of our report dated January 17, 2002 (except for the second paragraph of Note 17, as to which the date is February 22, 2002), with respect to the consolidated financial statements and schedule of Citrix Systems, Inc. included in the Annual Report (Form 10-K) for the year ended December 31, 2001. /s/ Ernst & Young, LLP West Palm Beach, Florida March 27, 2002