POWER OF ATTORNEY

        Know all by these presents, that the undersigned hereby constitutes and
appoints each of Jill Andersen and Jane Pritchett Henderson of Adagio
Therapeutics, Inc. (the "Company") and Steven J. Abrams, Stephen M. Nicolai and
Amanda Brown of Hogan Lovells US LLP, signing singly, and with full power of
substitution, each as the undersigned's true and lawful attorney-in-fact to:

(1)     execute for and on behalf of the undersigned, in the undersigned's
capacity as an officer and/or a director of the Company, the undersigned's
application for EDGAR Access with the United States Securities and Exchange
Commission (Form ID application);

(2)     execute for and on behalf of the undersigned, in the undersigned's
capacity as an officer and/or a director of the Company, Forms 3, 4 and 5 in
accordance with Section 16(a) of the Securities Exchange Act of 1934 and the
rules thereunder;

(3)     do and perform any and all acts for and on behalf of the undersigned
which may be necessary or desirable to (A) complete and execute any such Forms
3, 4, or 5, (B) complete and execute any amendment or amendments thereto, and
(C) timely file such form with the United States Securities and Exchange
Commission and any stock exchange or similar authority; and

(4)     take any other action of any type whatsoever in connection with the
foregoing which, in the opinion of such attorney-in-fact, may be of benefit to,
and 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 attorney-in-fact, in
serving in such capacity at the request of the undersigned, are not assuming,
nor is the Company assuming, any of the undersigned's responsibilities to
comply with Section 16 of the Securities Exchange Act of 1934.

        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 the Company, (b) revocation by the undersigned in a signed
writing delivered to the foregoing attorneys-in-fact and (c) as to any
attorney-in-fact individually, until such attorney-in-fact is no longer
employed by the Company or employed by or a partner at Hogan Lovells US LLP or
another law firm representing the Company, as applicable.

        IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney
to be executed as of this 3rd day of July, 2022.

                                   /s/ David Hering
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                                   Signature

                                   David Hering
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