USS Seadragon (SS-194), a Sargo-class submarine, was the first ship of the United States Navy to be named for the seadragon. Her keel was laid on 18 April 1938 by the Electric Boat Company of Groton, Connecticut. She was christened and launched on 21 April 1939, sponsored by Mrs. J.O. Richardson (wife of the former Commander in Chief, Pacific Fleet), and commissioned on 23 October 1939 with Lieutenant John G. Johns in command.