Fiserv (FI) S-8 Registration of securities for employees

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 relating to the consolidated financial statements and financial statement schedule of Fiserv, Inc. (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) and management’s report on the effectiveness of internal control over financial reporting dated February 20, 2007, appearing in the annual report on Form 10-K of Fiserv, Inc. for the year ended December 31, 2006.

/s/ Deloitte & Touche LLP

Milwaukee, Wisconsin

May 23, 2007