| Hahnenbach | |
| Mouth: | Wiedau |
| Mouth Coordinates: | 53.0639°N 9.5725°W |
| Progression: | Wiedau→ |
| Subdivision Type1: | Country |
| Subdivision Type2: | State |
| Length: | 17.6km (10.9miles) |
Hahnenbach is a river of Lower Saxony, Germany. It flows into the Wiedau near Hemslingen.