USS New Orleans (CA-32) (formerly CL-32) was a United States Navy heavy cruiser, the lead ship of her class. The New Orleans-class were the last U.S. cruisers built to the specifications and standards of the Washington Naval Treaty of 1922. Such ships, with a limit of 10,000 tons standard displacement and 8-inch calibre main guns may be referred to as "treaty cruisers." The term "heavy cruiser" was not defined until the London Naval Treaty in 1930.