Castle Ventress was Asajj Ventress's citadel on the planet Rattatak during the Clone Wars. It was her base of operations and a prison to many Rattataki. She kept the lightsabers of her dead Jedi Master, Ky Narec, housed within the halls of the citadel.
During the Clone Wars, Jedi Knight Obi-Wan Kenobi and ARC trooper Alpha-17 were held in the castle's prison, where they were tortured by Ventress after the Second Battle of Jabiim. They eventually escaped after stealing Ky Narec's lightsaber and one of Ventress's Ginivex-class starfighter.
- Star Wars: Clone Wars – "Chapter 7" (Possible appearance)
- Star Wars: Republic 59: Enemy Lines (First appearance)
- Star Wars: Republic 60: Hate and Fear
- (First identified as Castle Ventress)