UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 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): June 20, 2013

PETROQUEST ENERGY, INC.

(Exact name of registrant as specified in its charter)

Commission File Number: 001-32681

Registrant’s telephone number, including area code: (337) 232-7028

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:

Item 7.01 Regulation FD Disclosure.

On June 20, 2013, PetroQuest Energy, Inc. (the “Company”) is furnishing certain additional information with respect to its recently announced pending acquisition of certain producing oil and gas assets located in the shallow waters of the Gulf of Mexico (the “Gulf of Mexico Acquisition”) as Exhibit 99.1 hereto and incorporated into this Item 7.01 by reference.

The information in Exhibit 99.1 is being furnished, not filed, pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”). Accordingly, the information in Exhibit 99.1 will not be incorporated by reference into any registration statement filed by the Company under the Securities Act of 1933, as amended, unless specifically identified therein as being incorporated therein by reference.

The foregoing description of the Gulf of Mexico Acquisition and the information in Exhibit 99.1 contain “forward-looking statements” within the meaning of the federal securities laws. Forward-looking statements include those regarding the our ability to successfully complete the Gulf of Mexico Acquisition, integrate it with our operations and realize the anticipated benefits from the Gulf of Mexico Acquisition, any unexpected costs or delays in connection with the Gulf of Mexico Acquisition, and other statements that are not historical in nature. No assurance can be given that actual future results will not differ materially from those contained in the forward-looking statements in this Current Report on Form 8-K. Although the Company believes that all such statements contained in this Current Report on Form 8-K are based on reasonable assumptions, there are numerous variables of an unpredictable nature or outside of the Company’s control that could affect the Company’s future results and the value of its shares. Each investor must assess and bear the risk of uncertainty inherent in the forward-looking statements contained in this Current Report on Form 8-K. Please refer to the Company’s filings with the SEC for additional discussion of risks and uncertainties that may affect the Company’s actual future results. The Company undertakes no obligation to update the forward-looking statements contained herein.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits

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SIGNATURE

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.