| Rotach | |
| Image Alt: | The Rotach at Friedrichshafen |
| Mouth Coordinates: | 47.6497°N 9.4953°W |
| Subdivision Type1: | Country |
| Length: | 39.4km (24.5miles) |
| Source1 Elevation: | 620m (2,030feet) |
| Mouth Elevation: | 395m (1,296feet) |
| Basin Size: | 136km2 |
The Rotach is a 39adj=midNaNadj=mid tributary of Lake Constance, which drains to the Rhine, in the German state of Baden-Württemberg. The river source is near the municipality of Wilhelmsdorf. It flows southward through Horgenzell and Oberteuringen before emptying into Lake Constance at the city of Friedrichshafen.