| Varenne | |
| Map: | Varenne (affluent de la Mayenne).png |
| Mouth Coordinates: | 48.3868°N -0.6107°W |
| Subdivision Type1: | Country |
| Length: | 60km (40miles) |
The Varenne (pronounced as /fr/) is a 60km (40miles) long river in western France located in the departments of Orne (Normandy) and Mayenne (Pays de la Loire). It is a tributary of the river Mayenne on the right side, and so is a sub-tributary of the Loire by Mayenne and Maine. It flows into the Mayenne near Ambrières-les-Vallées. Its longest tributaries are the Égrenne, the, the Halouze and the Andainette. The largest town on the Varenne is Domfront en Poiraie.