Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the reference to our firm under the caption “Experts” in this Registration Statement (Form S-3) and related Prospectus of Stericycle, Inc. for the registration of common stock, preferred stock and depositary shares and to the incorporation by reference therein of our reports dated March 2, 2015, with respect to the consolidated financial statements and schedule of Stericycle, Inc., and the effectiveness of internal control over financial reporting of Stericycle, Inc., included in its Annual Report (Form 10-K/A) for the year ended December 31, 2014, filed with the Securities and Exchange Commission.

/s/ Ernst & Young LLP

Chicago, IL

September 8, 2015