Fortress may also refer to:
- Black Knights' Fortress, a castle inhabited by black knights entered during Black Knights' Fortress and King's Ransom
- Dark Warriors' Fortress, a castle in levels 14, 15 and 16 multi-combat Wilderness north of Falador.
- Dragonkin fortress, Ungael, an island located in northernmost region of the Lunar Sea, home of Vorkath
- Zamorak's Fortress, a God chamber in the God Wars Dungeon containing K'ril Tsutsaroth, Balfrug Kreeyath, Tstanon Karlak, and Zakl'n Gritch