| Teisnach | |
| Source1 Location: | Confluence of Wolfertsrieder Bach and Achslacher Bach |
| Mouth Coordinates: | 49.0421°N 12.9932°W |
| Subdivision Type1: | Country |
| Subdivision Type2: | State |
| Length: | 23.8km (14.8miles) |
| Mouth Elevation: | 448m (1,470feet) |
Teisnach is a river of Bavaria, Germany. It flows into the Schwarzer Regen, the upper course of the Regen, in the town Teisnach.