February 23, 2018

U.S. Securities and Exchange Commission

100 F. Street, N.E.

Washington, D.C. 20549

Re: Notice of Disclosure Filed in the Annual Report on Form 10-K Under Section 219 of the Iran Threat Reduction and Syria Human Rights Act of 2012 and Section 13(r) of the Exchange Act

Ladies and Gentlemen:

Pursuant to Section 219 of the Iran Threat Reduction and Syria Human Rights Act of 2012 and Section 13(r) of the Securities Exchange Act of 1934, as amended, notice is hereby provided that Chubb Limited has made disclosure pursuant to such provisions in its Annual Report on Form 10-K for the year ended December 31, 2017, which was filed with the Securities and Exchange Commission on February 23, 2018.

Very truly yours,

Chubb Limited

By: /s/ Paul Medini

Name: Paul Medini

Title: Chief Accounting Officer