| Conflans-sur-Seine | |
| Commune Status: | Commune |
| Arrondissement: | Épernay |
| Canton: | Vertus-Plaine Champenoise |
| Insee: | 51162 |
| Postal Code: | 51260 |
| Mayor: | Jean-Paul Caccia[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Sézanne-Sud Ouest Marnais |
| Coordinates: | 48.5514°N 3.68°W |
| Elevation M: | 90 |
| Area Km2: | 6.14 |
Conflans-sur-Seine (pronounced as /fr/, literally Conflans on Seine, before 1962: Conflans)[2] is a commune in the Marne department in north-eastern France.[3]