Châtillon is a commune in the southwestern suburbs of Paris, France. It is located 7 km from the center of Paris. The town was formerly named …Châtillon is a commune in the southwestern suburbs of Paris, France. It is located 7 km from the center of Paris. The town was formerly named Châtillon-sous-Bagneux, and a relic of this denomination remains in at least one road sign in Vanves.