POWER OF ATTORNEY

Be it known, that the undersigned, Ronald W. Barnhill (the "Reporting Person"),
hereby constitutes and appoints Beth Sibley as the Reporting Person's true and
lawful attorney-in-fact to:

	(1)	execute for and on behalf of the Reporting Person in the Reporting Person's
capacity as an officer or director of Group 1 Automotive, Inc. (the "Company"),
Forms 3, 4 and 5 in accordance with Section 16(a) of the Securities Exchange Act
of 1934, as amended (the "Exchange Act"), and the rules thereunder;

	(2)	do and perform any and all acts for and on behalf of the Reporting Person
which may be necessary or desirable to complete and execute any such Form 3, 4
or 5 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 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 Reporting Person.

	The Reporting Person 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 Reporting Person
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 the virtue of this power of attorney and the rights and powers herein
granted.  The Reporting Person acknowledges that the foregoing
attorneys-in-fact, in serving in such capacity at the request of the Reporting
Person, are not assuming, nor is the Company assuming, any of the Reporting
Person's responsibilities to comply with Section 16 of the Exchange Act.

	This Power of Attorney shall remain in full force and effect until the
Reporting Person is no longer required to file Forms 3, 4 and 5 with respect to
the Reporting Person's holdings of, and transactions in, securities issued by
the Company, unless earlier revoked by the Reporting Person in a signed writing
delivered to the foregoing attorney-in-fact.

	IN WITNESS WHEREOF, the Reporting Person has caused this Power of Attorney to
be executed as of this 25th day of August, 2011.


							/s/Ronald W. Barnhill

STATE OF TEXAS

COUNTY OF HARRIS

	On this 25th day of August, 2011, Ronald W. Barnhill personally appeared before
me, and acknowledged that he executed the foregoing instrument for the purposes
therein contained.

	IN WITNESS WHEREOF, I have hereunto set my hand and official seal.



						Denise M Gordon
						Notary Public