UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K/A

Amendment No. 1

For the fiscal year ended December 31, 2011

OR

For the transition period from              to             

Commission file number: 1-13461

Group 1 Automotive, Inc.

(Exact name of registrant as specified in its charter)

Securities registered pursuant to Section 12(b) of the Act:

Securities registered pursuant to Section 12(g) of the Act: None.

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    Yes  x    No  ¨

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.    Yes  ¨    No  x

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  x    No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate website, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this Chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  x    No  ¨

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).  ¨    No  x

The aggregate market value of common stock held by non-affiliates of the registrant was approximately $925.6 million based on the reported last sale price of common stock on June 30, 2011, which is the last business day of the registrant’s most recently completed second quarter.

As of February 6, 2012, there were 22,712,734 shares of our common stock, par value $0.01 per share, outstanding.

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the registrant’s definitive proxy statement for its 2012 Annual Meeting of Stockholders, which will be filed with the Securities and Exchange Commission within 120 days of December 31, 2011, are incorporated by reference into Part III of this Form 10-K.

EXPLANATORY NOTE

Group 1 Automotive, Inc. (the “Company”) is filing this Amendment No. 1 (the “Amendment”) to its Annual Report on Form 10-K for the fiscal year ended December 31, 2011 (the “Initial Form 10-K”) solely to amend Part III, Item 10 “Directors, Executive Officers and Corporate Governance” to clarify that, pursuant to Instruction G to Form 10-K, we are incorporating by reference certain information required by Item 10 from the information disclosed in our definitive proxy statement prepared in connection with the 2012 Annual Meeting of Stockholders, which will be filed with the SEC within 120 days of December 31, 2011.

This Amendment does not reflect events occurring after the filing of the Initial Form 10-K or modify or update those disclosures affected by subsequent events. Except as described above, no other modifications or changes have been made to the Initial Form 10-K as originally filed or the exhibits filed therewith.

Part III

Executive Officers

The information contained under Part I, “Business — Executive Officers” is incorporated by reference into this Item 10.

Directors

John L. Adams

Mr. Adams has served as non-executive Chairman of the Board since April 2005 and as one of our directors since November 1999. Mr. Adams served as Executive Vice President of Trinity Industries, Inc., one of North America’s largest manufacturers of transportation, construction and industrial products, from January 1999 through June 2005. He served as Vice Chairman of Trinity Industries from July 2005 through March 2007. Before joining Trinity Industries, Mr. Adams spent 25 years in various positions with Texas Commerce Bank N.A. and its successor, Chase Bank of Texas, National Association. From 1997 to 1998, Mr. Adams was Chairman, President and Chief Executive Officer of Chase Bank of Texas. Mr. Adams serves on the Board of Directors and is Chairman of the Finance and Risk Management Committee of Trinity Industries, Inc. and on the Board and Audit Committee of Dr. Pepper Snapple Group, Inc., a refreshment beverage business. Mr. Adams also serves on the Board of Directors of the Children’s Medical Center of Dallas, as a Trustee of The American Heart Association — Dallas, and on the University of Texas Chancellor’s Council and Business School Advisory Board.

Earl J. Hesterberg

Mr. Hesterberg’s biographical information may be found in part 1, “Item 1. Business.”

Louis E. Lataif

Mr. Lataif has served as one of our directors since August 2002. He served as Dean of the School of Management at Boston University from 1991 until 2010 following a distinguished 27-year career with Ford Motor Company, a global manufacturer and distributor of cars, trucks and automotive parts. While at Ford, he was named General Manager of Ford Division and elected a corporate Vice President, then Ford’s youngest officer, and served as President, Ford of Europe from l988 to l991. Mr. Lataif serves on the Board of Directors, the Compensation Committee and the Nominating Committee of Magna International Inc., a global automotive supplier, and on the Board of Directors and the Audit Committee of Abiomed, Inc., a manufacturer and marketer of heart assist and replacement systems. He is a member of the Board of Directors of Interaudi Bank, an FDIC insured bank providing personal, commercial and asset management banking services to both U.S. and foreign clients. Mr. Lataif is also a member of the Board of Trustees of the Iacocca Foundation, a non-profit organization to fund diabetes research and a member of the advisory board of Cannon Design, an international architectural, engineering and interior design firm.

Stephen D. Quinn

Mr. Quinn has served as one of our directors since May 2002. Mr. Quinn joined Goldman, Sachs & Co., a full-service global investment banking and securities firm, in August 1981 where he specialized in corporate finance. From 1990 until his retirement in 2001, Mr. Quinn served as a General Partner and Managing Director of Goldman, Sachs & Co. Mr. Quinn also serves on the Board of Directors, the Audit Committee and the Risk Oversight Committee of Zions Bancorporation.

Beryl Raff

Ms. Raff has served as one of our directors since June 2007. Since April 2009, she has served as Chairman and Chief Executive Officer of Helzberg Diamond Shops, Inc., a retail and online jewelry retailer, and an indirect wholly owned subsidiary of Berkshire Hathaway Inc. Ms. Raff served as Executive Vice President-general merchandising manager from 2005 through 2009, and as Senior Vice President from 2001 through 2005, for the fine jewelry

division of J.C. Penney Company, Inc., a holding company for J.C. Penney Corporation, Inc., a leading retailer of apparel and home furnishings. Ms. Raff serves on the Advisory Board of Jewelers Circular Keystone, a leading trade publication and industry authority, the Advisory Board of Jewelers of America, a non-profit trade organization committed to social responsibility and improving consumer confidence in the jewelry industry, and on the Executive Board of Jewelers Vigilance Committee, a non-profit organization focused on legal and regulatory issues facing the jewelry industry. Ms. Raff is also a Director of the NACD Heartland Chapter, a non-profit organization dedicated to excellence in board leadership and the Make-A-Wish Foundation, a non-profit organization which grants the wishes of children with life threatening medical conditions. From 2001 through February 2011, Ms. Raff served on the Board of Directors, the Corporate Governance Committee and the Compensation Committee (which she chaired from 2008 to 2011) of Jo-Ann Stores, Inc., a national specialty retailer of craft, sewing and decorating products.

J. Terry Strange

Mr. Strange has served as one of our directors since October 2003. In 2002, Mr. Strange retired from KPMG, LLP, an independent accounting firm, where he served from 1996 to 2002 as Vice Chairman, Managing Partner of U.S. Audit Practice and head of KPMG’s internal risk management program. Mr. Strange served as Global Managing Partner of Audit Business and a member of KPMG’s International Executive Committee from 1998 to 2002. During his 34-year career at KPMG, his work included interaction with the Financial Accounting Standards Board and the SEC, testifying before both bodies on issues impacting the auditing profession and SEC registrants. Mr. Strange serves on the Boards of Directors and the Audit Committees of New Jersey Resources Corporation, a retail and wholesale energy service provider, Newfield Exploration Company, an oil and gas exploration and production company, and SLM Corporation (Sallie Mae), a leading provider of student loans and an administrator of college savings plans.

Max P. Watson

Mr. Watson has served as one of our directors since May 2001. Mr. Watson served as President and Chief Executive Officer of BMC Software, Inc., a leading provider of enterprise management solutions, from April 1990 to January 2001. He served as Chairman of the Board of Directors of BMC from January 1992 to April 2001. Mr. Watson serves on the Board of Trustees of Texas Children’s Hospital. From January 2007 through December 2008, Mr. Watson served as Chairman of the Board of Trustees of Texas Children’s Hospital.

Code of Ethics

We have adopted a Code of Ethics for Specified Officers, which is applicable to our principal executive officer and other senior financial officers, who include our principal financial officer, principal accounting officer or controller, and persons performing similar functions. The Code, which we refer to as our Financial Code of Ethics, is available on our Internet website at www.group1auto.com. To the extent required by SEC rules, we intend to disclose any amendments to this code and any waiver of a provision of the code for the benefit of our principal executive officer, principal financial officer, principal accounting officer or controller, or persons performing similar functions, on our website within four business days following any such amendment of waiver, or within any other period that may be required under SEC rules from time to time.

Pursuant to Instruction G to Form 10-K, we incorporate by reference the remaining information required for this Item 10 from the information to be disclosed in our definitive proxy statement prepared in connection with the 2012 Annual Meeting of Stockholders, which will be field with the SEC within 120 days of December 31, 2011.

PART IV

(a) List of documents filed as part of this Form 10-K:

(1) Financial Statements

The financial statements listed in the accompanying Index to Financial Statements are filed as part of this Form 10-K.

(2) Financial Statement Schedules

All schedules have been omitted since the required information is not present or not present in amounts sufficient to require submission of the schedule, or because the information required is included in the Consolidated Financial Statements and notes thereto.

(3) Index to Exhibits

Those exhibits required to be filed by Item 601 of Regulation S-K are listed in the Exhibit Index immediately preceding the exhibits filed herewith and such listing is incorporated herein by reference.

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized on the 29th day of February, 2012.

EXHIBIT INDEX