| Baslieux-sous-Châtillon | |
| Commune Status: | Commune |
| Arrondissement: | Épernay |
| Canton: | Dormans-Paysages de Champagne |
| Insee: | 51038 |
| Postal Code: | 51700 |
| Mayor: | Xavier Carton[1] |
| Term: | 2020 - 2026 |
| Coordinates: | 49.1236°N 3.8°W |
| Elevation M: | 110 |
| Area Km2: | 5.88 |
Baslieux-sous-Châtillon (in French pronounced as /baljø su ʃatijɔ̃/, literally Baslieux under Châtillon) is a commune in the Marne department in northeastern France.