| Natzschung | |
| Image Alt: | Natzschung valley in winter |
| Source1 Location: | near Načetín |
| Source1 Coordinates: | 50.5502°N 13.27°W |
| Mouth Location: | Flöha, Olbernhau |
| Mouth Coordinates: | 50.6508°N 13.3702°W |
| Subdivision Type1: | Countries |
| Length: | 16.5km (10.3miles) |
| Source1 Elevation: | 820m (2,690feet) |
| Mouth Elevation: | 468m (1,535feet) |
| Basin Size: | 80.3km2 |
The Natzschung (Czech: Načetínský potok) is a river in Bohemia (Czech Republic) and Saxony (Germany). It is a left tributary of the Flöha, which it joins in Olbernhau. For much of its length it forms the border between Czech Republic and Germany.