The SS Meriwether Lewis (Hull Number 170) was a Liberty ship built in the United States during World War II. She was named after Meriwether Lewis, an American explorer who, along with William Clark, led the Corps of Discovery which explored the American West. The ship was laid down on 19 May 1941, then launched on 19 October 1941. She was part of a convoy on the way to Great Britain and carried a cargo of ammunition and tires when she was torpedoed by U-634 in the North Atlantic Ocean on 3 March 1943 at position . There were no survivors from her crew of 72 men.