San Demetrio London is a 1943 British World War II docudrama based on the true story of the 1940 salvage of the tanker MV San Demetrio by some of her own crew, who reboarded her after she had been set on fire by the German heavy cruiser Admiral Scheer and then abandoned, during the Battle of the Atlantic.

The film is a reconstruction of the story of the salvage of the British tanker, MV San Demetrio.

Carrying a cargo of oil home from Galveston, Texas, she was abandoned by her crew having been set on fire by shells from the German cruiser Admiral Scheer.

After drifting for three days, the occupants of the third, who included the chief engineer and the second officer, reboarded the burning San Demetrio, extinguished the fires, and, having managed to restart the engines, returned to Britain, sailing into the Clyde ten days later.

[5] The Monthly Film Bulletin said that "In places the music is a trifle too strident; some of the model shots are less successful than others, but on the whole justice has been done to a great theme.