Lastours (Occitan:Las Tors) is a commune in the Aude department in southern France.

Lastours is located 12 km (7.5 mi) outside Carcassonne, in the valley of the Orbiel. There are four small castles each built on a large 300 m high rocky ridge. The castles were built to control the access to Montagne Noire and the Cabardes region. These are some of the few original Cathar castles left.