POWER OF ATTORNEY

	The undersigned hereby constitutes and appoints each of David W. Grzebinski and
Raj Kumar, each with the authority to act alone, as the undersigned's true and
lawful attorney-in-fact to:

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

	2.	take any and all actions on behalf of the undersigned that may be necessary
or desirable to complete and execute any such Form 3, 4 or 5, complete and
execute any amendment to such form and timely file such form with the United
States Securities and Exchange Commission and any stock exchange or similar
authority; and

	3.	take any other action of any kind in connection with the foregoing that, in
the opinion of such attorney-in-fact, may be of benefit to, in the best interest
of, or legally required of, the undersigned, with the documents executed by such
attorney-in-fact on behalf of the undersigned pursuant to this Power of Attorney
to be in such form and contain such terms and conditions as such
attorney-in-fact may approve in his or her discretion.

	The undersigned grants to each such attorney-in-fact full power and authority
to take such actions as may be necessary or proper in the exercise of the
authority herein granted, as fully as the undersigned could if acting
personally, 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 pursuant to this Power of
Attorney.  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.

	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
attorneys-in-fact. The undersigned hereby revokes any previous powers of
attorney granted by the undersigned relating to the same subject matter as this
Power of Attorney.

DATED October 4, 2022

							/s/ Ronald A. Dragg
							Signature

							Ronald A. Dragg