| Frunthorn | |
| Elevation M: | 3030 |
| Prominence M: | 291 |
| Prominence Ref: | [1] |
| Map: | Switzerland |
| Location: | Graubünden, Switzerland |
| Range: | Lepontine Alps |
| Coordinates: | 46.5862°N 9.0891°W |
The Frunthorn is a mountain of the Swiss Lepontine Alps, overlooking the Zervreilasee in the canton of Graubünden. It is located west of Vals, on the ridge between the Val Lumnezia and the Valsertal.