POWER OF ATTORNEY

	Know all by these presents, that the undersigned hereby constitutes and
appoints each of (i) the Chief Executive Officer of Adverum Biotechnologies,
Inc., a Delaware corporation (the "Company"), who is currently Laurent Fischer,
(ii) the President and Chief Financial Officer of the Company, who is currently
Leone Patterson, (iii) the Chief Legal Officer of the Company, who is currently
Peter Soparkar, (iv) Joleen Morgan and (v) Ron A. Metzger of Cooley LLP, and
their respective successors, signing singly, with full power of substitution, 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 director of the Company, Forms 3, 4 and 5
(including amendments thereto) in accordance with Section 16(a) of the
Securities Exchange Act of 1934 and the rules and regulations thereunder;

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

	(3)	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,
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 the Company assuming, any of the undersigned's responsibilities to comply
with Section 16 of the Securities Exchange Act of 1934.

The undersigned agrees that each such attorney-in-fact herein may rely entirely
on information furnished orally or in writing by the undersigned to such
attorney-in-fact.  The undersigned also agrees to indemnify and hold harmless
the Company and each such attorney-in-fact against any losses, claims, damages
or liabilities (or actions in these respects) that arise out of or are based
upon any untrue statements or omission of necessary facts in the information
provided by the undersigned to such attorney-in fact for purposes of executing,
acknowledging, delivering or filing Forms 3, 4 or 5 (including amendments
thereto) and agrees to reimburse the Company and such attorney-in-fact for any
legal or other expenses reasonably incurred in connection with investigating or
defending against any such loss, claim, damage, liability or action.

This Power of Attorney shall remain in full force and effect until the
undersigned is no longer required to file Forms 3, 4 or 5 with respect to the
undersigned's holdings of and transactions in securities issued by the Company,
unless earlier (a) revoked by the undersigned in a signed writing delivered to
the foregoing attorneys-in-fact or (b) superseded by a new power of attorney
regarding the purposes outlined in the first paragraph hereof dated as of a
later date.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
executed as of this 28th day of May, 2021.

/s/ Julie Clark