| Source1 location | Warstein |
|---|---|
| Mouth location | Möhne |
| Mouth coordinates | 51.4889°N 8.3331°E |
| Country | Germany |
| State | North Rhine-Westphalia |
| Length | 14.3 km (8.9 mi) |
| Tributaries left | Schorenbach |
| Tributaries right | Langer Bach, Treise |
Wester (in its upper course: Wideybach) is a 14-km long river, a southern tributary of Möhne of North Rhine-Westphalia, Germany. It flows between the Warstein and Belecke subdivisions (German: ortsteil) of the town of Warstein.