Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in this Registration Statement on Form S-8 of our reports dated February 27, 2008 (which report includes an explanatory paragraph relating to the Company’s adoption of Statement of Financial Accounting Standards No. 123R, Share-Based Payment, on January 1, 2006, as described in Note 6), relating to the consolidated financial statements and financial statement schedule of Fiserv, Inc., and the effectiveness of Fiserv Inc.’s internal control over financial reporting, appearing in the Annual Report on Form 10-K of Fiserv Inc. for the year ended December 31, 2007.

/s/ Deloitte & Touche LLP

Milwaukee, Wisconsin

March 4, 2008