USS Gar (SS-206), a Tambor-class submarine, was the only ship of the United States Navy to be named for the gar, a fish of the Lepisosteidae family. Her keel was laid down by the Electric Boat Company in Groton, Connecticut. She was launched on 7 November 1940 sponsored by Mrs. George T. Pettengill, wife of Rear Admiral Pettengill, and commissioned at New London on 14 April 1941 with Lieutenant D. McGregor in command.