Exhibit 23.1
CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
We consent to the incorporation by reference in this Registration Statement on FormS-3 of our reports dated February 21, 2018, relating to the consolidated financial statements of Discover Financial Services and the effectiveness of Discover Financial Services’ internal control over financial reporting, appearing in the Annual Report on Form10-K of Discover Financial Services for the year ended December 31, 2017, and to the reference to us under the heading “Experts” in the Prospectus, which is part of this Registration Statement.
/s/ DELOITTE & TOUCHE LLP
Deloitte & Touche LLP
Chicago, Illinois
June 22, 2018
