USS R-25 (SS-102) was an R-class coastal and harbor defense submarine built for the United States Navy during World War I.

The R-boats built by Lake Torpedo Boat Company (R-21 through R-27) are sometimes considered a separate class from those of the other builders.

[1] For surface running, the boats were powered by two 500-brake-horsepower (373 kW) diesel engines, each driving one propeller shaft.

Arriving 11 January 1920, she was given hull classification symbol SS-102 in July and, except for overhaul periods at Balboa and on the East Coast, operated in the waters off the Panama Canal Zone until the fall of 1923.

She was laid up at League Island until was struck from the Naval Vessel Register on 9 May 1930 and sold for scrap the following July.