SV Marion Lightbody was a Russian full-rigged ship that was torpedoed by the Imperial German submarine in the Atlantic Ocean near the Fastnet Rock on 8 July 1915 while she was travelling from Valparaíso, Chile to Queenstown, Ireland while carrying a cargo of barley.

Construction Marion Lightbody was launched on 17 April 1888 and completed the same year at the Henderson D. & W. & Co. Ltd. shipyard in Meadowside, United Kingdom. The ship was long, had a beam of and had a depth of . She was assessed at and had four masts.

Sinking Marion Lightbody was travelling from Valparaíso, Chile to Queenstown, Ireland while carrying a cargo of barley when on 8 July 1915, she was torpedoed by the Imperial German submarine in the Atlantic Ocean near the Fastnet Rock, just over a month after the same submarine had torpedoed and sunk the RMS Lusitania in the same vicinity. The 25 crewmen escaped the ship in a dinghy and were later picked up by a British patrol boat before being brought to Queenstown.

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