Editas Medicine, Inc.

300 Third Street, First Floor

Cambridge, MA 02142


January 29, 2016




Securities and Exchange Commission

Division of Corporation Finance

100 F Street, N.E.

Washington, D.C.  20549


Re:                             Editas Medicine, Inc.

Registration Statement on Form S-1

File No. 333-208856

Request for Acceleration


Ladies and Gentlemen:


Pursuant to Rule 461 promulgated under the Securities Act of 1933, as amended, Editas Medicine, Inc. (the “Registrant”) hereby requests acceleration of the effective date of its Registration Statement on Form S-1 (File No. 333-208856), as amended (the “Registration Statement”), so that it may become effective at 4:00 p.m. Eastern time on February 2, 2016, or as soon thereafter as practicable.


The Registrant hereby acknowledges that:


(i)                                    should the Securities and Exchange Commission (the “Commission”) or the staff, acting pursuant to delegated authority, declare the Registration Statement effective, it does not foreclose the Commission from taking any action with respect to the Registration Statement;


(ii)                                 the action of the Commission or the staff, acting pursuant to delegated authority, in declaring the Registration Statement effective, does not relieve the Registrant from its full responsibility for the adequacy and accuracy of the disclosure in the Registration Statement; and


(iii)                             the Registrant may not assert staff comments and the declaration of effectiveness of the Registration Statement as a defense in any proceeding initiated by the Commission or any person under the federal securities laws of the United States.




Very truly yours,











/s/ Katrine S. Bosley



Name: Katrine S. Bosley



Title:   President and Chief Executive Officer