| Allerbach | |
| Pushpin Map: | Germany |
| Pushpin Map Caption: | Location of mouth |
| Source1 Coordinates: | 51.8632°N 9.7691°W |
| Mouth Coordinates: | 51.8222°N 9.7455°W |
| Progression: | Bewer→ |
| Subdivision Type1: | Country |
| Subdivision Type2: | State |
Allerbach is a river of Lower Saxony, Germany.
The Allerbach springs near, a district of Einbeck. It is a left tributary of the Bewer east of, a district of Dassel.