Perrou () is a commune in the Orne department in north-western France.
The commune is made up of the following collection of villages and hamlets, La Surie, La Foutelaie, Perrou, Belle Fontaine and La Pierre Blanche.
The commune is in the Normandie-Maine Regional Natural Park.
Perrou along with the communes of Champsecret, Les Monts d'Andaine, Juvigny Val d'Andaine, Dompierre and Domfront en Poiraie shares part of the Bassin de l'Andainette a Natura 2000 conservation site. The site measures 617 hectares and is home to creatures such as the Bullhead, Brook lamprey and white-clawed crayfish.