Morsang-sur-Orge (; 'Morsang-on-Orge') is a commune in the southern outer suburbs of Paris, France. It is located in the Essonne department, from the centre of Paris.
Inhabitants of Morsang-sur-Orge are known as Morsaintois.
Morsang-sur-Orge is served by no station of the Paris Métro, RER, or suburban rail network. The closest station to Morsang-sur-Orge is Savigny-sur-Orge station, which is approximately a 22-minute train journey from the center of Paris on the Paris RER line . This station is located in the neighboring commune of Savigny-sur-Orge, from the town center of Morsang-sur-Orge.