Battlecruiser Division 53 was a tactical unit of the Royal Manticoran Navy. In 1905 PD, the Division was under the command of Commodore Jack Prentis, and a part of the Manticoran forces at Hancock Station in Battlecruiser Squadron 5. Its flagship, the Redoubtable-class battlecruiser HMS Defiant, was destroyed in the First Battle of Hancock. (HH3)