Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the Registration Statement (Form S-8 No. 333-142070 and No. 333-208964) of our report dated June 28, 2016 with respect to the 2015 statements of net assets available for benefits and changes in net assets available for benefits of AECOM Retirement & Savings Plan in the Annual Report Form (11-K) as of and for the year ended December 31, 2015.

/s/ Vasquez & Company LLP

Los Angeles, California

June 28, 2016