SS John Harvey was a U.S. World War II Liberty ship. This ship is best known for carrying a secret cargo of mustard gas and whose sinking by German aircraft in December 1943 at the port of Bari in south Italy caused an unintentional release of chemical weapons.
The John Harvey was built by the North Carolina Shipbuilding Company in Wilmington, North Carolina, and launched on 9 January 1943. Her Maritime Commission Hull Number was 878, and she was rated as capable of carrying 504 soldiers. She was operated by Agwilines Inc.