QuickLinks -- Click here to rapidly navigate through this document

Exhibit 24.3

POWER OF ATTORNEY

        The undersigned, a director of Assured Guaranty Ltd., a Bermuda company (the "Company"), hereby constitutes and appoints Dominic J. Frederico, Robert Mills and James M. Michener, and each of them, the true and lawful attorneys-in-fact and agents of the undersigned, with full power of substitution and resubstitution, for and in the name, place and stead of the undersigned, in any and all capacities, to sign any and all amendments (including post-effective amendments) to the registration statement on Form S-1 (No. 333-111491) (the "Registration Statement") to effect the registration under the Securities Act of 1933, as amended (the "Act"), of common shares of the Company, and any registration statement relating to the offering covered by the Registration Statement and filed pursuant to Rule 462(b) under the Act, and to file the same, with all exhibits thereto, and other documents in connection therewith, with the Securities and Exchange Commission, and hereby grants to such attorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act and thing requisite and necessary to be done, as fully to all intents and purposes as the undersigned might or could do in person, hereby ratifying and confirming all that said attorneys-in-fact and agents, or any of them, or their or his substitute, or substitutes, may lawfully do or cause to be done by virtue hereof.

Dated: March 30, 2004 /s/  EVAN G. GREENBERG Director

QuickLinks

POWER OF ATTORNEY