| Platthorn | |
| Elevation M: | 3246 |
| Prominence M: | 361 |
| Prominence Ref: | [1] |
| Parent Peak: | Monte Rosa |
| Listing: | Alpine mountains above 3000 m |
| Map: | Switzerland |
| Location: | Valais, Switzerland |
| Range: | Pennine Alps |
| Coordinates: | 46.0536°N 7.7364°W |
The Platthorn is a mountain of the Swiss Pennine Alps, located south of Grächen in the canton of Valais. It lies north of the Färichhorn and the Balfrin, on the range between the Mattertal and the Saastal.