USS SC-4, during her service life known as Submarine Chaser No. 4 or S.C. 4, was an SC-1-class submarine chaser built for the United States Navy during World War I. SC-4 was a wooden-hulled 110-foot (34 m) submarine chaser built at Naval Station New Orleans in New Orleans, Louisiana. She was commissioned on 19 February 1918 as USS Submarine Chaser No. 4, abbreviated at the time as USS S.C. 4. During World War I, S.C. 4 served in the Special Hunting Squadron, USS Salem Group, on antisubmarine patrol duty against German submarines in the Gulf of Mexico, and was based at Key West, Florida.