Forbes Energy Services (FLSS) 10-Q 2011 Q2 Quarterly report

Exhibit 32.1

CERTIFICATION BY CHIEF EXECUTIVE OFFICER

PURSUANT TO 18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with this Quarterly Report of Forbes Energy Services Ltd. filed on Form 10-Q (the “Company”) for the quarter ended June 30, 2011, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, John E. Crisp, Chairman, Chief Executive Officer and President of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ John E. Crisp

John E. Crisp

Chairman, Chief Executive Officer and President

Date: August 15, 2011