The USS S-30 was a United States Navy submarine, part of the S-class fleet, commissioned in 1924. Designed for coastal defense, it was equipped with torpedoes and had a displacement of about 1,000 tons when submerged. The submarine was primarily used for training and patrolling during its service. In 1941, the USS S-30 was decommissioned and later sold for scrap in 1945. Its construction was part of a broader effort to enhance the U.S. Navy's capabilities during the interwar period, contributing to the development of future submarines like the USS Nautilus.