| Lossa | |
| Mouth Location: | Unstrut |
| Mouth Coordinates: | 51.2045°N 11.141°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | Germany |
| Subdivision Type2: | States |
| Subdivision Name2: | Saxony-Anhalt and Thuringia |
Lossa is a river of Saxony-Anhalt and Thuringia, Germany. It flows into the Unstrut in Leubingen.