Vieux () is a commune in the Calvados department in the Normandy region in northwestern France.
La Guigne river is the only watercourse to flow through the commune.
The town contains numerous Roman era ruins, as Vieux was a settlement called Aregenua, and appears on the Roman map, Tabula Peutingeriana. Vieux was the Roman capital of the Viducasses Gallic tribe.
During the Battle of Normandy in 1944, Vieux was designated as Hill 112 position, a strategic point for the Battle of Caen, the area of rue d'Esquay and the Bas de Vieux were badly affected by the allied bombardment of July 6, 1944. The portion of these streets, destroyed at this time are now dated for its name.
The commune has three sites listed as a Monument historique.
Vieux is twinned with: