The Iton () is a river in Normandy, France, left tributary of the river Eure. It is 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.