| Küstriner Bach | |
| Source1: | Großer Küstriner |
| Mouth Location: | Oberpfuhl |
| Mouth Coordinates: | 53.2165°N 13.329°W |
| Progression: | Woblitz→ |
| Subdivision Type1: | Country |
| Subdivision Name1: | Germany |
| Subdivision Type2: | State |
| Subdivision Name2: | Brandenburg |
Küstriner Bach is a river of Brandenburg, Germany. It flows into the Oberpfuhl, which is drained by the Woblitz, near Lychen. It does not take its name from the town Küstrin (Kostrzyn nad Odrą) but from the village Küstrinchen and the Großer Küstriner See, both near Lychen.