MV Plassy, or Plassey, was a steam trawler launched in late 1940 and named HMT Juliet in 1941. She was renamed Peterjon and converted to a cargo vessel in 1947. She was acquired by the Limerick Steamship Company in 1951 and renamed Plassy.

On 8 March 1960, while sailing through Galway Bay carrying a cargo of whiskey, stained glass, and yarn, she was caught in a severe storm and ran onto Finnis Rock, Inisheer, Aran Islands. The crew of 11 were safely taken off with the assistance of local islanders using a breeches buoy fired by rocket.

Several weeks later a second storm washed the ship off the rock and drove her ashore on the island.