| Landwasser | |
| Mouth Coordinates: | 50.9253°N 14.7433°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | Germany |
| Subdivision Type2: | States |
| Subdivision Name2: | Saxony |
The Landwasser is a river of Saxony, Germany. It is a left tributary of the Mandau, which it joins near Mittelherwigsdorf.