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