Baron-sur-Odon (French pronunciation: [baʁɔ̃ syʁ ɔdɔ̃] ⓘ) is a commune in the Calvados department in the Normandy region of north-western France.

[6][7] The river Odon forms the northern border of the commune as it flows north-east to join the Orne in Caen.

[9] René Lepelley meanwhile detects the Gallic barro meaning "fence" (in old French barre) or the Germanic anthroponym Baro.

[13] In June 1944, during Operation Epsom, the heights of Hill 112 south-east of Baron-sur-Odon (also in the communes of Fontaine-Étoupefour, Vieux, and Esquay-Notre-Dame) was one objectives for the liberation of Caen.

The explanation of this blazon follows:[14] The horseshoe symbolizes the escape of William the Conqueror (from Valognes to Falaise in 1047) with his horse shod in reverse to mislead his pursuers.