| Buckau | |
| Source1 Location: | south of Görzke |
| Mouth Location: | southern shore of Breitlingsee |
| Mouth Coordinates: | 52.3657°N 12.4622°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | Germany |
| Subdivision Type2: | State |
| Subdivision Name2: | Brandenburg |
| Length: | 35km (22miles) |
| Source1 Elevation: | 95m (312feet) |
| Mouth Elevation: | 28m (92feet) |
| Tributaries Right: | Riembach, Strynzelbach, Verlorenwasser |
Buckau is a river of Brandenburg, Germany. It flows into the Breitlingsee, which is drained by the Havel, near Brandenburg an der Havel.