Reliance was the 1903 America's Cup defender designed by Nat Herreshoff. Reliance was funded by a nine member syndicate of members of the New York Yacht Club headed by Cornelius Vanderbilt III. Reliance was designed to take full advantage of the Seawanhaka '90-foot' rating rule and was suitable only for use in certain conditions. The 1903 America's Cup was the last to be raced according to the Seawanhaka rule.