Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the use in this Registration Statement on Form F-1 of our report dated March 5, 2014, relating to the consolidated financial statements of Criteo S.A. and subsidiaries, appearing in the Prospectus, which is a part of this Registration Statement.

We also consent to the reference to us under the heading “Experts” in such Prospectus.

/s/ Deloitte & Associés

Represented by Fabien Brovedani

Neuilly-sur-Seine, France

March 5, 2014