Brétigny-sur-Orge is a commune in the southern suburbs of Paris, France. It is located 26.7 km. (16.6 miles) from the center of Paris.
Brétigny-sur-Orge is served by Brétigny station on Paris RER line C.
As of the census
of 1999, the population was .
The estimate for 2005 was .
Inhabitants of Brétigny-sur-Orge are known as Brétignolais.