Mouen () is a commune in the Calvados department in the Normandy region in northwestern France.
The commune is made up of the following collection of villages and hamlets, Le Vivier, La Bruyère, La Plauderie and Mouen.
The river Odon flows through the commune. In addition a stream the Ruisseau de Sabley traverses the commune.
Mouen, along with Mondrainville is twinned with: