Exhibit 23.1
CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
We consent to the incorporation by reference in this Registration Statement on FormS-8 of our reports dated February 27, 2020, relating to the financial statements of ACI Worldwide, Inc. and subsidiaries (the “Company”), and the effectiveness of the Company’s internal control over financial reporting, appearing in the Annual Report on Form10-K of the Company for the year ended December 31, 2019.
/s/ DELOITTE & TOUCHE LLP
Omaha, Nebraska
June 9, 2020
