Champeaux-sur-Sarthe (, literally Champeaux on Sarthe) is a commune in the Orne department in north-western France.
The town covers 9.5 km ò and has 185 people since the last population census from 2005. With a density of 19.5 inhabitants per km ò, Champeaux-sur-Sarthe, grew by 4.5% of its population compared with 1999.
The commune along with another 32 communes is part of a 3,503 hectare, Natura 2000 conservation area, called the Haute vallée de la Sarthe.