HMS Torbay is a Trafalgar-class nuclear submarine of the Royal Navy and the fourth vessel of her class. Torbay is the fifth vessel and the second submarine of the Royal Navy to be named after Torbay in Devon, England. The first was the 80-gun second rate HMS Torbay launched in 1693. Torbay was the first vessel to be fitted with the new command system SMCS-NG and therefore the first British warship to be controlled using the Microsoft Windows operating system.