The list of shipwrecks in August 1942 includes all ships sunk, foundered, grounded, or otherwise lost during August 1942.
For the foundering of the British cargo ship Lavington Court on this day, see the entry for 19 July 1942.
World War II: The Mahan-class destroyer struck a mine late on 3 August and sinks in the Pacific Ocean off Espiritu Santo with the loss of six of her 158 crew early on the 4th.
World War II: The Heywood-class attack transport was hit by a Mitsubishi G4M aircraft in Ironbottom Sound, Solomon Islands. She was subsequently scuttled due to damage sustained.
World War II: Operation Pedestal: The aircraft carrier was torpedoed and sunk in the Mediterranean Sea 72 nautical miles (133 km) south of Cape Salinas, Majorca, Spain (38°03′00″N 3°1′12″E / 38.05000°N 3.02000°E) by U-73 ( Kriegsmarine) with the loss of 131 of her 791 crew.