HMS Canopus was a pre-dreadnought battleship of the British Royal Navy and the lead ship of the Canopus class. Intended for service in Asia, Canopus and her sister ships were smaller and faster than the preceding Majestic-class battleships, but retained the same battery of four 12-inch (305 mm) guns. She also carried thinner armour, but incorporated new Krupp steel, which was more effective than the Harvey armour used in the Majestics. Canopus was laid down in January 1897, launched in October that year, and commissioned into the fleet in December 1899.