| Fontaine-en-Dormois | |
| Commune Status: | Commune |
| Arrondissement: | Châlons-en-Champagne |
| Canton: | Argonne Suippe et Vesle |
| Insee: | 51255 |
| Postal Code: | 51800 |
| Mayor: | Maryse Seignier[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Argonne Champenoise |
| Coordinates: | 49.2383°N 4.7183°W |
| Elevation M: | 171 |
| Elevation Min M: | 122 |
| Elevation Max M: | 194 |
| Area Km2: | 5.29 |
Fontaine-en-Dormois is a commune in the Marne department in north-eastern France.