Immunogen (IMGN) 10-K 2021 FY Annual report

EXHIBIT 23 

Consent of Independent Registered Public Accounting Firm 

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

(1) Registration Statement (Form S-8 Nos. 333-258631, 333-258629, 333-253753, 333-138713, 333-147738, 333-155540, 333-170788, 333-185086, 333-215196, 333-225281, 333-225860, 333-235632, 333-235633 and 333-251548) of ImmunoGen, Inc., and

(2) Registration Statement (Form S-3 No. 333-251502) of ImmunoGen, Inc.;

of our reports dated February 28, 2022, with respect to the consolidated financial statements of ImmunoGen, Inc. and the effectiveness of internal control over financial reporting of ImmunoGen, Inc. included in this Annual Report (Form 10-K) of ImmunoGen, Inc. for the year ended December 31, 2021.

/s/ Ernst & Young LLP

Boston, Massachusetts
February 28, 2022