Six ships of the United States Navy have been named USS Philadelphia, after the city of Philadelphia, Pennsylvania.
The second USS Philadelphia of the United States Navy was a 36 gun sailing frigate.
The fourth USS Philadelphia (C-4), also known as "Cruiser No. 4", was a cruiser of the United States Navy.
The fifth USS Philadelphia (CL-41), a Brooklyn class light cruiser of the United States Navy, was laid down 28 May 1935 at the Philadelphia Navy Yard; launched 17 November 1936; sponsored by Mrs. George H. Earle, first lady of Pennsylvania; and commissioned at Philadelphia 23 September 1937, Captain Jules James in command.
The third USS Philadelphia was the flagship of Rear Admiral Samuel Phillips Lee when he commanded the North Atlantic Blockading Squadron during the American Civil War.
USS Philadelphia (SSN-690), a Los Angeles-class submarine, was the sixth ship of the United States Navy to be named for Philadelphia, Pennsylvania. The contract to build her was awarded to the Electric Boat Division of General Dynamics Corporation in Groton, Connecticut on 8 January 1971 and her keel was laid down on 12 August 1972. She was launched on 19 October 1974 sponsored by Mrs.