HMS Truculent was a British submarine of the third group of the T-class. She was built as P315 by Vickers Armstrong, Barrow, and launched on 12 September 1942. She sank nine enemy vessels.

The submarine was funded by donations from the town of Glossop in Derbyshire, whose population raised £175,000 in 1942-3 to fund warships.

Truculent struck a Swedish oil tanker outside the mouth of the Medway in January 1950, and sank, with the loss of 64 men. The number was unusually high, as the submarine was ferrying workers in addition to the crew. In March 1950, the wreck was towed to the destined nearby dockyard then sold for scrap.

Regional navigation rules thereafter mandated a Truculent Light – a panoramic white light on the bow of submarines moving under their own power.

Truculent spent much of her World War II wartime service in the Pacific Far East, save for early 1943, operating on the European shelf. Here, in the Norwegian Sea she sank the German submarine U-308, with all hands on its first patrol.

She took part in Operation Source, towing the X-class midget submarine X-6 to Norway to attack the heavy Kriegsmarine warships Tirpitz, Scharnhorst and Lützow.

On her transfer to the Pacific, she sank the Japanese army cargo ship Yasushima Maru; the small vessel Mantai; the Hell ship Harugiku Maru with 180 of 720 POWs killed; and five Japanese sailing vessels. She also laid mines, one of which damaged the Japanese minelayer Hatsutaka.

She survived the war and returned to the United Kingdom to continue in service with the Royal Navy.