The Odon () is a river in the Calvados department, in Normandy, northwestern France. It is 47 km long and is a tributary of the Orne.
The rivers source is in the commune of Les Monts d'Aunay and eventually flows into the Orne in Caen. In addition to these two communes the river flows through the following twenty communes:
Baron-sur-Odon Bougy Bretteville-sur-Odon Dialan sur Chaîne Épinay-sur-Odon Éterville Fleury-sur-Orne Fontaine-Étoupefour Gavrus Grainville-sur-Odon Longvillers Louvigny Le Mesnil-au-Grain Mondrainville Mouen Parfouru-sur-Odon Seulline Tourville-sur-Odon Val d'Arry Verson
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