| Fontaine-Denis-Nuisy | |
| Commune Status: | Commune |
| Arrondissement: | Épernay |
| Canton: | Sézanne-Brie et Champagne |
| Insee: | 51254 |
| Postal Code: | 51120 |
| Mayor: | Nadine Legras[1] |
| Term: | 2020 - 2026 |
| Coordinates: | 48.6264°N 3.6872°W |
| Elevation M: | 125 |
| Area Km2: | 13.17 |
Fontaine-Denis-Nuisy is a commune in the Marne department in north-eastern France.