| Calenberger Bach | |
| Mouth Location: | Diemel |
| Mouth Coordinates: | 51.4879°N 9.1672°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | Germany |
| Subdivision Type2: | States |
| Subdivision Name2: | Hesse and North Rhine-Westphalia |
| Length: | 9.1km (05.7miles) |
| Pushpin Map: | North Rhine-Westphalia |
| Pushpin Map Size: | 300 |
| Pushpin Map Caption: | North Rhine-Westphalia |
| Pushpin Map Alt: | Relief Map of North Rhine-Westphalia |
Calenberger Bach (also: Fließbach, in its upper course: Ostertalsbach) is a small river of Hesse and North Rhine-Westphalia, Germany. It flows into the Diemel on the right bank in Warburg.