LIMITED POWER OF ATTORNEY

Know all by these presents, that the undersigned hereby makes, constitutes and
appoints each of John Crowley, Corey Manchester, Christopher Guerin, Seo Salimi
and Maria Stahl, signing singly and each acting individually, as the
undersigned"s true and lawful attorney in fact with full power and authority as
hereinafter described to:

	(1)	execute for and on behalf of the undersigned, in the undersigned"s capacity
as an officer and/or director of  Fusion Pharmaceuticals Inc. (the "Company"),
Forms 3, 4, and 5 (including any amendments thereto) in accordance with Section
16(a) of the Securities Exchange Act of 1934 and the rules thereunder (the
"Exchange Act");

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

	(3)	seek or obtain, as the undersigned"s representative and on the
undersigned"s behalf, information regarding transactions in the Company"s
securities from any third party, including brokers, employee benefit plan
administrators and trustees, and the undersigned hereby authorizes any such
person to release any such information to such attorney in fact and approves and
ratifies any such release of information; 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,
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 facts 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 facts 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 relieving,
nor is the Company assuming nor relieving, any of the undersigned"s
responsibilities to comply with Section 16 of the Exchange Act.  The undersigned
acknowledges that neither the Company nor the foregoing attorneys in fact assume
(i) any liability for the undersigned"s responsibility to comply with the
requirement of the Exchange Act, (ii) any liability of the undersigned for any
failure to comply with such requirements, or (iii) any obligation or liability
of the undersigned for profit disgorgement under Section 16(b) of the Exchange
Act.

	This Power of Attorney shall remain in full force and effect until 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,
unless earlier revoked by the undersigned in a signed writing delivered to the
foregoing attorneys in fact.

	IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
executed as of
October 24, 2022.


							Signature


							/s/Dmitri Bobilev
							Dmitri Bobilev
                                                        Print Name