| Lannertbach | |
| Mouth Location: | Grubebach |
| Mouth Coordinates: | 51.8142°N 8.3641°W |
| Progression: | Grubebach→ |
| Subdivision Type1: | Country |
| Subdivision Type2: | States |
Lannertbach is a small river of North Rhine-Westphalia, Germany. It is 4.8 km long and flows into the Grubebach as a right tributary[1] near Rheda-Wiedenbrück.