Coordinates: 48°48′00″N 2°17′24″E / 48.8000°N 2.2900°E / 48.8000; 2.2900

Châtillon (French pronunciation: [ʃɑ.ti.jɔ̃]) is a commune in the southwestern suburbs of Paris, France. It is located 7 km (4.3 mi) 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 (located at the junction Blvd du Lycée and Avenue Ch. de Gaulle, and written as Châtillon s/ B).

The TGV trains are maintained at the "Établissement Industriel de Maintenance du TGV de Châtillon" (EIM TGV de Châtillon).

Châtillon is served by Châtillon - Montrouge station on Paris Métro Line 13.

Châtillon enjoys a well connected bus service: from Paris, the 68 comes all the way from the Place de Clichy to the metro station. Buses 194, 195 and 295 all leave Porte d'Orleans and pass by the Chatillon metro station from where they continue mostly in different directions. The 162 running east and west of Chatillon can take you to the RER station in Meudon, or the Shopping Centre to the east. The 394 which passes by the market is ideal for Clamart, Vanves, and Issy les Moulineaux. If you need to get to Issy from the metro, then take the 126.