| Wahnbach | |
|---|---|
 | |
 | |
| Location | |
| Country | Germany |
| State | North Rhine-Westphalia |
| Physical characteristics | |
| Mouth | |
• location | Sieg |
• coordinates | 50°47′38″N 7°16′18″E / 50.7939°N 7.2717°E / 50.7939; 7.2717 |
| Length | 29.4 km (18.3 mi) 1 |
| Basin features | |
| Progression |
Sieg→ Rhine→ North Sea |
Wahnbach is a river of North Rhine-Westphalia, Germany. It flows into the Sieg near Hennef.