The Ille (French pronunciation: [il] ^ⓘ; Breton: Il) is a small river in Brittany, France, right tributary of the river Vilaine. It is 48.9 km (30.4 mi) long.^[1] It flows into the Vilaine in the city Rennes.

The Ille is linked to the semi-tidal Rance river by the Canal d'Ille-et-Rance. By this canal, Rennes has a connection with the English Channel coast at St. Malo. The canal is used primarily for tourist boats.

The Ille flows through the department Ille-et-Vilaine and the following towns: Montreuil-sur-Ille, Betton and Rennes. From Montreuil to Rennes the river runs parallel to the Canal d'Ille-et-Rance.