Saint-Nicolas-des-Bois () is a commune in the Orne department in north-western France.
The commune along with 26 others contains part of the Forêt d'ÃÂcouves.
The Commune along with another 11 communes shares part of a 5,255 hectare, Natura 2000 conservation area, called the Vallée du Sarthon et affluents.