USS Diodon (SS-349), a Balao-class submarine, was a ship of the United States Navy named for Diodon, a genus of the porcupine fishes. Diodon (SS-349) was launched 10 September 1945 by Electric Boat Company, Groton, Connecticut; sponsored by Mrs. D. Cullinane; and commissioned 18 March 1946, Lieutenant Commander J. M. Hingson in command. During its 1956–1957 tour of duty in the Far East, Diodon visited Brisbane, Australia, for the celebration commemorating the World War II Allied victory in the Battle of the Coral Sea in May 1942. It served again in the Far East in 1958–1959 and 1960.