| Semmadon | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Semmadon 70.svg |
| Coordinates: | 47.74°N 5.8717°W |
| Insee: | 70486 |
| Postal Code: | 70120 |
| Arrondissement: | Vesoul |
| Canton: | Jussey |
| Elevation Min M: | 245 |
| Elevation Max M: | 316 |
| Area Km2: | 10.82 |
Semmadon is a commune in the Haute-Saône department in the region of Bourgogne-Franche-Comté in eastern France.