Cellectis (CLLS) S-8 Registration of securities for employees

Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in the Registration Statement (FormS-8) pertaining to the 2018 Stock Option Plan, BSA Plan and the Second Free Share 2018 Plan of Cellectis S.A. of our reports dated March 13, 2018, with respect to the consolidated financial statements and the effectiveness of internal control over financial reporting of Cellectis S.A., included in its annual report (Form20-F) for the year ended December 31, 2017, filed with the Securities and Exchange Commission.

/s/ ERNST & YOUNG et Autres

ERNST & YOUNG et Autres

Paris La Défense, France

October 5, 2018