Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in this Registration Statement on Form S-3 of our reports dated August 7, 2015, relating to the consolidated financial statements and consolidated financial statement schedule of Automatic Data Processing, Inc. and subsidiaries (the “Company”), and the effectiveness of the Company’s internal control over financial reporting, appearing in the Company’s Annual Report on Form 10-K for the year ended June 30, 2015, and to the reference to us under the heading “Experts” in the prospectus, which is part of this Registration Statement.

/s/ Deloitte & Touche LLP

Parsippany, New Jersey

August 27, 2015