| Untere Steinach | |
| Mouth Coordinates: | 50.1275°N 11.5269°W |
| Progression: | Schorgast→ |
| Subdivision Type1: | Country |
| Subdivision Type2: | State |
| Length: | 24.7km (15.3miles) |
The Untere Steinach (or Lower Steinach, in its upper course: Rehbach) is a river in Bavaria, Germany. It flows into the Schorgast in Untersteinach.