Moulins-sur-Orne (, literally Moulins on Orne) is a commune in the Orne department in north-western France.
The commune is made up of the following collection of villages and hamlets, Moulins-sur-Orne, Les Marteaux' and Bel à Âuvre.
The commune is within the area known as the Plaine d'Argentan, which is known for its cereal growing fields and horse stud farms.
Moulins-sur-Orne along with another 65 communes is part of a 20,593 hectare, Natura 2000 conservation area, called the Haute vallée de l'Orne et affluents.
The commune has three rivers running through it, the river Orne and one of its tributaries the Houay, plus a tributary to the Houay, called the Ruisseau des Fontaines Thiot
Jardin de Marigny is an English styled garden of 9000m2 that is occasionally opened to the public. The garden is a member of the Union des Parcs et Jardins de Normandie (Calvados-Manche-Orne).