| Châtillon-sur-Morin | |
| Commune Status: | Commune |
| Arrondissement: | Épernay |
| Canton: | Sézanne-Brie et Champagne |
| Insee: | 51137 |
| Postal Code: | 51310 |
| Mayor: | Alain Sohier[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Sézanne-Sud Ouest Marnais |
| Coordinates: | 48.7142°N 3.58°W |
| Elevation M: | 155 |
| Area Km2: | 18.05 |
Châtillon-sur-Morin (pronounced as /fr/, literally Châtillon on Morin) is a commune in the Marne department in north-eastern France.