| Bredenbek | |
| Mouth Coordinates: | 53.6857°N 10.1167°W |
| Subdivision Type1: | Country |
| Subdivision Type2: | States |
| Length: | 8km (05miles) |
| Source1 Elevation: | 24.5m (80.4feet) |
| Mouth Elevation: | 13m (43feet) |
Bredenbek is a small river of Schleswig-Holstein and Hamburg, Germany. It flows into the Alster near Hamburg-Bergstedt.