POWER OF ATTORNEY

    Know all by these present, that the undersigned hereby constitutes and
appoints each of Matthew P. Blischak of Finch Therapeutics Group, Inc., and
William Michener and Lisa Folkerth of Ropes & Gray LLP with full power of
substitution, signing individually, the undersigned's true and lawful
attorneys-in fact and agents to:

     (1)execute for and on behalf of the undersigned, in the undersigned's
        capacity as an officer, director or beneficial owner of more than 10%
        of a registered class of securities of Finch Therapeutics Group, Inc.,
        Forms 3, 4, and 5 (including any amendments thereto), relating to the
        securities of Finch Therapeutics Group, Inc., in accordance with
        Section I 6(a) of the Securities Exchange Act of 1934, as amended (the
        "Exchange Act") and the rules thereunder and a Form ID, Uniform
        Application for Access Codes to File on EDGAR;

     (2)do and perform any and all acts for and on behalf of the undersigned
        that may be necessary or desirable to execute such Forms 3, 4, or 5, or
        Form ID (including any amendments thereto) and timely file such forms
        with the United States Securities and Exchange Commission and any stock
        exchange or similar authority; and

     (3)take any other action of any nature whatsoever in connection with the
        foregoing which, in the opinion of such attorney-in-fact, may be of
        benefit, in the best interest of, or legally required by, the
        undersigned, it being understood that the documents executed by such
        attorney-in-fact on behalf of the undersigned pursuant to this Power of
        Attorney shall be in such form and shall contain such terms and
        conditions as such attorney-in-fact may approve in such attorney-in-
        fact's discretion.

    The undersigned hereby grants to each such attorney-in-fact full power
and authority to do and perform any and every act and thing whatsoever
requisite, necessary or proper to be done in the exercise of any of the rights
and powers herein granted, as fully to all intents and purposes as the
undersigned might or could do if personally present, with full power of
substitution or revocation, hereby ratifying and confirming all that such
attorney-in-fact, or such attorney-in-fact's substitute or substitutes, shall
lawfully do or cause to be done by virtue of this power of attorney and the
rights and powers herein granted. The undersigned acknowledges that the
foregoing attorneys-in-fact, in serving in such capacity at the request of the
undersigned, are not assuming, nor is Finch Therapeutics Group, Inc. assuming,
any of the undersigned's responsibilities to comply with Section 16 of the
Exchange Act.

    This Power of Attorney shall remain in full force and effect until the
earliest to occur of (a) the undersigned is no longer required to file Forms 3,
4 and 5 with respect to the undersigned's holdings of and transactions in
securities issued by Finch Therapeutics Group, Inc., (b) revocation by the
undersigned in a signed writing delivered to the foregoing attorneys-in-fact or
(c) as to any attorney-in-fact individually, until such attorney-in-fact is no
longer employed by Finch Therapeutics Group, Inc. or Ropes & Gray LLP.

The undersigned has caused this Power of Attorney to be executed as of May 11,
2023.

                                   /s/ Christian Lange
                                   -------------------
                                   CHRISTIAN LANGE