Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the following Registration Statements:

(1)Registration Statements (Forms S-8 Nos. 333-227965, 333-230164, 333-236701, 333-253530 and 333-262923) pertaining to the Amended and Restated 2018 Equity Incentive Plan and 2018 Employee Stock Purchase Plan of Allogene Therapeutics, Inc., and

(2)Registration Statement (Form S-3 No. 333-268117) of Allogene Therapeutics, Inc.;

of our reports dated February 28, 2023, with respect to the consolidated financial statements of Allogene Therapeutics, Inc. and the effectiveness of internal control over financial reporting of Allogene Therapeutics, Inc. included in this Annual Report (Form 10-K) of Allogene Therapeutics, Inc. for the year ended December 31, 2022.

/s/ Ernst & Young LLP

San Mateo, California

February 28, 2023