| Rottach | |
| Mouth Coordinates: | 47.739°N 10.3136°W |
| Subdivision Type1: | Country |
| Subdivision Type2: | State |
| Length: | 14.1km (08.8miles) |
Rottach (also: Große Rottach) is a river of Bavaria, Germany. It is a left tributary of the Iller at Kempten. Note that there is another river also called Rottach 18 kilometres upstream which is a right tributary of the Iller.