USS O-1 (SS-62) was the lead ship of her class of submarines built for the United States Navy during World War I.

The O-class submarines were designed to meet a Navy requirement for coastal defense boats.

[2] For surface running, the boats were powered by two 440-brake-horsepower (328 kW) diesel engines, each driving one propeller shaft.

Commissioned just before the Armistice with Germany, O-1 operated in the Atlantic coastal waters from Cape Cod to Key West, Florida, after World War I. Reclassified a second-line submarine on 25 July 1924, and first-line on 6 June 1928, O-1 was converted to an experimental vessel on 28 December 1930, and operated in this capacity out of the submarine base at New London, Connecticut, until decommissioning on 11 June 1931.

This article incorporates text from the public domain Dictionary of American Naval Fighting Ships.