| Châtillon-Saint-Jean | |
| Commune Status: | Commune |
| Arrondissement: | Valence |
| Canton: | Romans-sur-Isère |
| Insee: | 26087 |
| Postal Code: | 26750 |
| Mayor: | Daniel Barruyer[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CA Valence Romans Agglo |
| Coordinates: | 45.0889°N 5.1317°W |
| Elevation M: | 194 |
| Elevation Min M: | 192 |
| Elevation Max M: | 343 |
| Area Km2: | 8.82 |
Châtillon-Saint-Jean (pronounced as /fr/; Vivaro-Alpine: Chastilhon e Sent Joan) is a commune in the Drôme department in southeastern France.