Exhibit 32.1

CERTIFICATION

     Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (subsections (a) and (b) of Section 1350, chapter 63 of title 18, United States Code), the undersigned officer of Allied World Assurance Company Holdings, Ltd (the “Company”), hereby certifies, to such officer’s knowledge, that:

     The Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2009 (the “Report”) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Dated: May 8, 2009	By: Name:	/s/ Scott A. Carmilani Scott A. Carmilani
	Title:	President and Chief Executive Officer

     The foregoing certification is being furnished solely pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (subsections (a) and (b) of Section 1350, chapter 63 of title 18, United States Code) and is not being filed as part of the Report.