Cairon () is a commune in the Calvados department in the Normandy region in northwestern France.
The commune of Cairon is situated in Normandy, in Calvados, 5 kilometers to the north-west of Caen.
The Mue river and its tributary the Vey flow through Cairon.
Cairon, Karon in 1077 and Cayron in 1231: the toponym was probably formed from the Gallo-Roman Carius by adding the suffix -onis.
During the Invasion of Normandy, Cairon was liberated on 11 June 1944 by the 46th Royal Marine Commando.
The demonym (previously gentilic) is Caironnais.