| Mandelbach | |
| Mouth Location: | Blies |
| Mouth Coordinates: | 49.1346°N 7.1314°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | Germany |
| Subdivision Type2: | States |
| Subdivision Name2: | Saarland |
Mandelbach is a river of Saarland, Germany. It flows into the Blies in Habkirchen. The municipality Mandelbachtal takes its name from this river.