MV San Demetrio was a British motor tanker, notable for her service during the Second World War. She was built in 1938 for the Eagle Oil and Shipping Company. In 1940 she was damaged by enemy action in mid-Atlantic, abandoned by her crew but later re-boarded and successfully brought into harbour. She was the subject of a 1943 feature film, "San Demetrio London", one of the few films that recognised the heroism of the UK Merchant Navy crews during the War.