| Osterbek | |
| Name Other: | Osterbekkanal |
| Subdivision Type1: | Country |
| Subdivision Name1: | Germany |
| Subdivision Type2: | State |
| Subdivision Name2: | Hamburg |
| Length: | 8.5km (05.3miles) |
| Source1 Location: | Farmsen-Berne, Hamburg |
| Source1 Coordinates: | 53.6214°N 10.1119°W |
| Source1 Elevation: | 20m (70feet) |
| Mouth: | Alster (Außenalster) |
| Mouth Location: | Winterhude, Hamburg |
| Mouth Coordinates: | 53.5764°N 10.0058°W |
| Mouth Elevation: | 6m (20feet) |
| Tributaries Left: | Hopfengraben |
| Tributaries Right: | Seebek |
| Custom Label: | Progression |
Osterbek is a river of Hamburg, Germany. The Osterbek has its source at Farmsen-Berne in the Hamburg borough of Wandsbek. After crossing into the borough of Hamburg-Nord, the Osterbek becomes navigable as Osterbekkanal. It joins the Alster at Außenalster, between the districts Winterhude and Uhlenhorst.