USS SC-40, until July 1920 known as USS Submarine Chaser No. 40 or USS S.C. 40, was an SC-1-class submarine chaser built for the United States Navy during World War I. SC-40 was a wooden-hulled 110-foot (34 m) submarine chaser built at the New York Navy Yard at Brooklyn, New York. She was commissioned on 13 February 1918 as USS Submarine Chaser No. 40, abbreviated at the time as USS S.C. 40. In 1919, Submarine Chaser No. 40 participated in North Sea minesweeping operations to clear the North Sea Mine Barrage after World War I.