| Lutter | |
| Mouth Location: | Aa |
| Mouth Coordinates: | 52.0637°N 8.6158°W |
| Subdivision Type1: | Country |
| Subdivision Type2: | State |
| Length: | 13.3km (08.3miles) |
Lutter (also: Lutterbach) is a river of North Rhine-Westphalia, Germany. The river Aa is formed at its confluence with the Johannisbach (considered the upper course of the Aa).