Atara Biotherapeutics (ATRA) 10-K 2019 FY Annual report

Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in registration statements No. 333-223262 on Form S-3; and No. 333-199508, No. 333-204076, No. 333-209961, No. 333-214431, No. 333-219763, No. 333-223254, and No. 333-229861 on Form S-8 of our reports dated February 27, 2020, relating to the consolidated financial statements of Atara Biotherapeutics, Inc. and subsidiaries (the “Company”) and the effectiveness of the Company’s internal control over financial reporting, appearing in this Annual Report on Form 10-K of Atara Biotherapeutics, Inc. for the year ended December 31, 2019.

/s/ DELOITTE & TOUCHE LLP

San Jose, California

February 27, 2020