Six vessels of the British Royal Navy have been named HMS Valiant.

• Valiant , launched in 1759 at Chatham, was a third-rate ship of the line of 74 guns.
• Valiant , launched in 1807, was another third-rate.
• Valiant , launched in 1825, was another third-rate.
• Valiant, launched in 1863, was a Hector-class ironclad battleship, scrapped in 1957.
• Valiant, launched in 1914, was a Queen Elizabeth-class battleship that served in World War I and World War II.
• Valiant (S102), launched in 1963, was a nuclear-powered submarine, the lead boat of her class. She was paid off in 1994.