UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT PURSUANT

TO SECTION 13 OR 15(D) OF THE

SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported) August 9, 2006

W&T Offshore, Inc.

(Exact name of registrant as specified in its charter)

1-32414

(Commission File Number)

Nine Greenway Plaza, Suite 300

Houston, Texas 77046-0905

(Address of Principal Executive Offices)

(713) 626-8525

(Registrant’s Telephone Number, Including Area Code)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

Item 7.01. Regulation FD Disclosure.

On August 9, 2006, the Company issued a press release announcing that the underwriters for the recently completed public offering by W&T Offshore have exercised their over-allotment option to purchase an additional 1.275 million shares of W&T’s common stock. The sale of the additional shares by the Company will increase the net proceeds received by the Company, after estimated offering expenses from the offering, by approximately $40.2 million. W&T Offshore intends to use the net proceeds from the offering and over-allotment shares to finance a portion of the cash consideration related to the Kerr-McGee transaction and for general corporate purposes.

Lehman Brothers, Jefferies & Company and Morgan Stanley served as joint book-running managers for the offering. A written prospectus and records relating to the offering may be obtained from the offices of Lehman Brothers Inc., c/o ADP Financial Services, Integrated Distribution Services, 1155 Long Island Avenue, Edgewood, NY 11717, Fax (631) 254-7268 or by e-mail at monica_castillo@adp.com; Jefferies & Company, Inc. at 520 Madison Ave., 12th Floor, New York, New York 10012, (212) 284-2011 or by e-mail at csmall@jefferies.com; and Morgan Stanley & Co. Incorporated, Prospectus Department, 180 Varick Street, 2nd Floor, New York, NY 10014, (866) 718-1649 or by e-mail at prospectus@morganstanley.com.

The shares were offered pursuant to an effective shelf registration statement that W&T Offshore previously filed with the U.S. Securities and Exchange Commission. This press release shall not constitute an offer to sell or the solicitation of an offer to buy nor shall there be any sale of these securities in any state in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of such state.

A copy of the press release is attached hereto as Exhibit 99.1.

This information is furnished pursuant to Item 7.01 of Form 8-K and shall not be deemed filed for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, unless specifically incorporated by reference in a document filed under the Securities Act of 1933, as amended, or the Exchange Act. By filing this report on Form 8-K and furnishing this information, the Company makes no admission as to the materiality of any information in this report that is required to be disclosed solely by Item 7.01.

Item 9.01. Financial Statement and Exhibits

(d) Exhibits.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

INDEX TO EXHIBITS