HMS Mars was a Royal Navy pre-dreadnought battleship of the Majestic class, the seventh member of a class of nine ships. The ship was laid down in the Laird Brothers shipyard in June 1894, she was launched in March 1896, and she was commissioned into the fleet in June 1897. She was armed with a main battery of four 12-inch (305 mm) guns and a secondary battery of twelve 6-inch (152 mm) guns. The ship had a top speed of 16 knots (30 km/h; 18 mph).