| Langendernbach | |
| Mouth Location: | Elbbach |
| Mouth Coordinates: | 50.5347°N 8.0417°W |
| Subdivision Type1: | Country |
Langendernbach (also: Dernbach) is a small river of Rhineland-Palatinate and Hesse, Germany. It flows into the Elbbach in the village Langendernbach.