| Hammerbach | |
| Subdivision Type1: | Countries |
| Mouth Coordinates: | 49.8136°N 12.7628°W |
| Progression: | Mže→ |
| Length: | 33.8km (21miles) |
| Basin Size: | 197km2 |
The Hammerbach (German;) is a river of Bavaria, Germany and of the Czech Republic. It is a left tributary of the Mže, joining it near Kočov.