| Petitmagny | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason Petitmagny.svg |
| Coordinates: | 47.7222°N 6.8986°W |
| Insee: | 90079 |
| Postal Code: | 90170 |
| Arrondissement: | Belfort |
| Canton: | Giromagny |
| Mayor: | Alain Bourdeaux[1] |
| Term: | 2020 - 2026 |
| Elevation Min M: | 419 |
| Elevation Max M: | 880 |
| Area Km2: | 2.20 |
Petitmagny (in French pronounced as /pətimaɲi/; German: Kleinmenglatt) is a commune in the Territoire de Belfort department in Bourgogne-Franche-Comté in northeastern France.