Aspen Insurance Holdings Limited (AHL-PE) 10-Q 2006 Q3 Quarterly report

Exhibit 32.1

CERTIFICATION 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 on Form 10-Q of Aspen Insurance Holdings Limited (the ‘‘Company’’) for the nine months ended September 30, 2006 as filed with the Securities and Exchange Commission on the date hereof (the ‘‘Report’’), Christopher O’Kane as Chief Executive Officer of the Company and Julian Cusack as Chief Financial Officer, each hereby certifies, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 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.

By:  /s/ Christopher O’Kane
        Name: Christopher O’Kane
        Title: Chief Executive Officer
        Date: November 3, 2006

By:  /s/ Julian Cusack
        Name: Julian Cusack
        Title: Chief Financial Officer
        Date: November 3, 2006

This certification accompanies the Report pursuant to § 906 of the Sarbanes-Oxley Act of 2002 and shall not, except to the extent required by the Sarbanes-Oxley Act of 2002, be deemed filed by the Company for purposes of §18 of the Securities Exchange Act of 1934, as amended.