SS Tregenna was a cargo steamship that was launched in England in 1919 and sunk by a U-boat in the Battle of the Atlantic in 1940 with the loss of 33 of her 37 crew.

She was laid down as War Bulldog, but the Hain Steam Ship Co bought her before she was completed and renamed her Tregenna.

[4] In August 1921 Tregenna reported sighting the wreckage of a SNETA Farman Goliath aircraft that had ditched in the English Channel.

[9] From May 1940 Tregenna made transatlantic crossings to bring steel from Philadelphia to South Wales, sailing eastbound in HX convoys from Halifax, Nova Scotia to UK waters.

At 1626 hrs that afternoon U-65 hit Tregenna with one torpedo 78 nautical miles (144 km) northwest of Rockall.