Iton (French pronunciation: [itɔ̃]) is a river in Normandy, France, left tributary of the river Eure. It is 131.8 km (81.9 mi) long. Its source is near Moulins-la-Marche. For about 10 km between Orvaux and Glisolles, it disappears and pursues a subterranean course.

The Iton flows through the following départements and towns:

• Orne: Crulai, Chandai
• Eure: Bourth, Damville, La Bonneville-sur-Iton, Évreux

It flows into the Eure in Acquigny, south of Louviers.

Its basin (1,300 km²) covers 134 communes and is subject to a schéma d'aménagement et de gestion des eaux (water management scheme).

• Avancement des SAGE du bassin Seine-Normandie SAGE on the Seine-Normandy basin (in French)