| Pleichach | |
| Mouth Location: | Main |
| Mouth Coordinates: | 49.7993°N 9.9232°W |
| Subdivision Type1: | Country |
| Subdivision Type2: | State |
| Subdivision Name2: | Bavaria |
| Length: | 33.8km (21miles) |
| Basin Size: | 128km2 |
The Pleichach is a river in Lower Franconia, Bavaria, Germany. Its source is near the village Hausen bei Würzburg. It passes through Oberpleichfeld, Unterpleichfeld, Rimpar and the city of Würzburg. It flows into the Main at the northern edge of the city centre of Würzburg.