Viry-Châtillon is a commune in the southern suburbs of Paris, France. It is located from the center of Paris.
Viry-Châtillon is twinned with Wokingham, United Kingdom and Erftstadt, Germany.
At the 1999 census
, the population was . The estimate for 2005 was .
Inhabitants of Viry-Châtillon are known as Castelvirois.
Viry-Châtillon is served by Viry-Châtillon
station on Paris RER line D