| Wacker | |
| Mouth Coordinates: | 51.4281°N 8.2665°W |
| Subdivision Type1: | Country |
| Subdivision Type2: | State |
| Length: | 4.5km (02.8miles) |
| Tributaries Left: | Hormecke |
The Wacker is a small river of North Rhine-Westphalia, Germany. It is a left tributary of the Bache (the upper course of the Heve). The Heve is a tributary of the Möhne.