Castle may refer to:
- Ardougne Castle, where King Lathas and his paladins live and from where East Ardougne is ruled.
- Burthorpe Castle, a castle in the north-central part of Burthorpe that contains the Games Room as well as the current home of Crown Prince Anlaf and base of the Burthorpe Imperial Guard.
- Camelot Castle, a castle east of Seers' Village where King Arthur and his Knights of the Round Table reside.
- Castle Drakan, an inaccessible fortress just north of Meiyerditch where the Drakans and their servants live.
- Castle Wars, a minigame to the west of Yanille.
- Dark Warriors' Fortress, a castle in level 14, 15 and 16 multi-combat Wilderness, north of Falador.
- Deep Wilderness Castle Ruins, an ancient ruined fortress situated on a peninsula in deep Wilderness.
- Deserted Keep, an abandoned part of a castle in the deep Wilderness.
- Etceteria Castle, the biggest and mightiest building on Etceteria in which Queen Sigrid resides.
- Fenkenstrain's Castle, a castle in Morytania that Dr. Fenkenstrain stole from Lord Rologarth.
- Lumbridge Castle, a populated free-to-play castle where the ruler of Lumbridge, Duke Horacio, lives.
- Miscellania Castle, home of King Vargas and his children and the king's advisor, Ghrim.
- Rogues' Castle, a relatively vacant Wilderness area that is haunted by the Chaos Elemental.
- Varrock Palace, a castle in Varrock and the home of King Roald and his wife.
- White Knights' Castle, the centre of Falador and base of the White Knights.
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