The ship was armed with a main battery of four BL 12-inch Mk VIII guns in twin-gun turrets, one forward and one aft. The turrets were placed on pear-shaped barbettes; six of her sisters had the same arrangement, but her sisters and and all future British battleship classes had circular barbettes. "Victorious" also carried a secondary battery of twelve QF 6-inch /40 guns. They were mounted in casemates in two gun decks amidships. She also carried sixteen QF 12-pounder guns and twelve QF 2-pounder guns for defence against torpedo boats. She was also equipped with five torpedo tubes, four of which were submerged in the ship's hull, with the last in a deck-mounted launcher.