USS Grayling (SS-209), a Tambor-class submarine, was the fourth ship of the United States Navy to be named for the grayling, a fresh-water game fish closely related to the trout. Her keel was laid down at the Portsmouth Navy Yard in Kittery, Maine on 15 December 1939. She was launched on 4 September 1940 sponsored by Mrs. Herbert F. Leary, and commissioned on 1 March 1941 with Lieutenant Commander Eliot Olsen in command.