| Fontoy | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Fontoy (Moselle).svg |
| Arrondissement: | Thionville |
| Canton: | Algrange |
| Insee: | 57226 |
| Postal Code: | 57650 |
| Mayor: | Mathieu Weis[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CA Portes de France-Thionville |
| Coordinates: | 49.3567°N 5.9958°W |
| Elevation M: | 270 |
| Elevation Min M: | 205 |
| Elevation Max M: | 387 |
| Area Km2: | 16.88 |
Fontoy (pronounced as /fr/; de|Fentsch; Lorraine Franconian: Fensch) is a commune in the Moselle department in Grand Est in north-eastern France.
It contains the source of the Fensch river.