Four ships of the Royal Navy have been named HMS Colossus:

• Colossus (1787) - A 74-gun sail battleship of the Leviathan class, launched at Gravesend.
• Colossus (1882) - Second-class battleship of the Colossus class.
• Colossus (1910) - Dreadnought battleship of the Colossus class, commissioned in 1911. She fought at the Battle of Jutland and was scrapped in 1928 due to the Washington Treaty.
• Colossus - Light aircraft carrier of the Colossus class, commissioned in 1944. She had a relatively brief time with the Royal Navy. In 1946 she was loaned then sold to France and renamed Arromanches. In 1978 she was scrapped.