| Saint-Hilaire-sous-Romilly | |
| Commune Status: | Commune |
| Arrondissement: | Nogent-sur-Seine |
| Canton: | Romilly-sur-Seine |
| Insee: | 10341 |
| Postal Code: | 10100 |
| Mayor: | Francesco Lo Briglio[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Portes de Romilly-sur-Seine |
| Coordinates: | 48.5172°N 3.655°W |
| Elevation M: | 105 |
| Area Km2: | 20.2 |
Saint-Hilaire-sous-Romilly (pronounced as /fr/, literally Saint-Hilaire under Romilly) is a commune in the Aube department in north-central France.