HMS Conqueror was a Churchill-class nuclear-powered submarine that served in the Royal Navy from 1971 to 1990. She was built by Cammell Laird in Birkenhead. As of 2007, she is the only nuclear-powered submarine to have engaged an enemy ship with torpedoes, sinking the cruiser ARA General Belgrano.

HMS Conqueror was an Orion class battleship of the Royal Navy. She served in the 2nd Battle Squadron of the Grand Fleet in World War I, and fought at the battle of Jutland, 31 May 1916, suffering no damage.

Nine vessels of the British Royal Navy have been named HMS Conqueror.

HMS Conqueror a 74-gun 3rd rate ship of the line which fought at Trafalgar under the command of Captain Israel Pellew, brother of Sir Edward Pellew. Pellew's captain of marines took the surrender of the overall commander of the French-Spanish fleet, Admiral Villeneuve's sword, aboard the French ship Bucentaure (80). However, he was not able to deliver the sword back to the Conqueror as she had passed on to engage another ship and it was received by the captain of Mars.

HMS Conqueror was an ironclad battleship of the Victorian Royal Navy, whose main armament was an armoured ram.