HMS Conqueror (nickname "Conks") was a Churchill-class nuclear-powered fleet submarine that served in the Royal Navy from 1971 to 1990. She was built by Cammell Laird in Birkenhead (the only British nuclear fleet submarine not to be built at Barrow-in-Furness). She is the only nuclear-powered submarine known to have engaged an enemy ship with torpedoes, sinking the cruiser General Belgrano with two Mark 8 torpedoes during the 1982 Falklands War.
Conqueror was the third submarine of her class, following on from the earlier Churchill and Courageous. The submarines were designed to face the Soviet threat at sea by attacking other ships and submarines, and spying on Soviet nuclear-armed submarine movements.