Saint Paterne - Le Chevain is a commune in the department of Sarthe, northwestern France. The municipality was established on 1 January 2017 by merger of the former communes of Saint-Paterne (the seat) and Le Chevain.
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.
Population data refer to the area corresponding with the commune as of January 2025.