USS R-25 (SS-102) was an R-class coastal and harbor defense submarine of the United States Navy. Her keel was laid down 26 April 1917 by the Lake Torpedo Boat Company in Bridgeport, Connecticut; the R-boats built by Lake Torpedo Boat (R-21 through R-27) are sometimes considered a separate class from those built by Fore River Shipbuilding (R-1 through R-14) and Union Iron Works (R-15 through R-20). She was launched on 15 May 1919 sponsored by Mrs. Richard H. M. Robinson, and commissioned on 23 October 1919 with Lieutenant Commander Charles A. Lockwood, Jr., in command.