| Lottbek | |
| Mouth Location: | Bredenbek |
| Mouth Coordinates: | 53.6844°N 10.1321°W |
| Progression: | Bredenbek→ |
| Subdivision Type1: | Country |
| Subdivision Name1: | Germany |
| Subdivision Type2: | States |
Lottbek is a small stream in Schleswig-Holstein and Hamburg, Germany. It flows into the Bredenbek near Bergstedt.