| Rotbach | |
| Mouth Location: | Erft |
| Mouth Coordinates: | 50.8266°N 6.779°W |
| Subdivision Type1: | Country |
| Subdivision Type2: | State |
| Length: | 39.2km (24.4miles) |
| Basin Size: | 236km2 |
Rotbach is a river of North Rhine-Westphalia, Germany. It is a left tributary of the Erft.