SS Comet

SS Comet may refer to one of several Type C2 ships built for the United States Maritime Commission:


 * SS Comet (1939) (MC hull number 33, Type C2), built by Federal Shipbuilding; transferred to the United States Navy as Castor-class general stores issue ship USS Pollux (AKS-2); wrecked and lost in Newfoundland in 1942
 * SS Comet (1941) (MC hull number 125, Type C2-T), built by Tampa Shipbuilding; transferred to the United States Navy as Lassen-class ammunition ship USS Shasta (AE-6); scrapped in 1972
 * USS Comet (AP-166) (MC hull number 293, Type C2-S-B1), built in 1943 by Moore Dry Dock as SS Comet; transferred to the United States Navy as a La Salle-class transport; sold for commercial use in 1948; scrapped in 1970

SS Comet may also refer to one of several commercial passenger steamships:


 * PS Comet, a paddle steamer built in 1811 in Port Glasgow; provided first successful commercial passenger service in Europe; shipwrecked in 1820 near Oban.
 * Comet (steamboat), a wooden steamship built in 1857 in Cleveland, Ohio; carried cargo and passengers on the Great Lakes; shipwrecked 1875 in Lake Superior with a cargo of silver ore.