INDEPENDENT AUDITORS' CONSENT Exhibit 23.1 We consent to the incorporation by reference in this Registration Statement of Fiserv, Inc. on Form S-3 of our reports dated January 30, 1998, appearing in and incorporated by reference in the Annual Report on Form 10-K of Fiserv, Inc. for the year ended December 31, 1997 and to the reference to us under the heading "Experts" in the Prospectus, which is part of this Registration Statement. DELOITTE & TOUCHE LLP Milwaukee, Wisconsin June 2, 1998