SS Lake Arthur (ID-2915) was a Design 1020 cargo ship that served in the Naval Overseas Transportation Service (NOTS) of the United States Navy during World War I. Originally ordered and begun under the name SS War Plum, she was renamed SS Lake Arthur by the United States Shipping Board (USSB). After her naval service, she operated commercially under a variety of names, before being scuttled in the North Sea with a load of chemical weapons in November 1945.