| Sindernbach | |
| Source1 Location: | on the east of the Mountain Lahnkopf, Rothaar Mountains |
| Mouth Location: | in the village Nenkersdorf in the Sieg |
| Mouth Coordinates: | 50.8959°N 8.1948°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | Germany |
| Subdivision Type2: | State |
| Subdivision Name2: | North Rhine-Westphalia |
| Length: | 3.58km (02.22miles) |
| Source1 Elevation: | 570m (1,870feet) |
| Mouth Elevation: | 365m (1,198feet) |
| Basin Size: | 3.471km2 |
| Tributaries Left: | Nickseifen, Birkenborn |
| Tributaries Right: | Butzbach |
Sindernbach (pronounced as /de/) is a river of North Rhine-Westphalia, Germany, which is 3.58 kilometers in length. It has its source on the east of the mountain Lahnkopf in the Rothaar Mountains in an elevation of 570 meters, and it flows into the river Sieg in the village of Nenkersdorf in an elevation of 365 meters above sea level.