| Grosmagny | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason Grosmagny.svg |
| Coordinates: | 47.7231°N 6.8844°W |
| Insee: | 90054 |
| Postal Code: | 90200 |
| Arrondissement: | Belfort |
| Canton: | Giromagny |
| Mayor: | Maurice Leguillon[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Vosges du Sud |
| Elevation Min M: | 401 |
| Elevation Max M: | 915 |
| Area Km2: | 9.46 |
Grosmagny (in French pronounced as /ɡʁomaɲi/; German: Großmenglatt) is a commune in the Territoire de Belfort department in Bourgogne-Franche-Comté in northeastern France.