| Châteauneuf-sur-Isère | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Châteauneuf-sur-Isère (Drôme).svg |
| Arrondissement: | Valence |
| Canton: | Tain-l'Hermitage |
| Insee: | 26084 |
| Postal Code: | 26300 |
| Mayor: | Frédéric Vassy[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CA Valence Romans Agglo |
| Coordinates: | 45.0147°N 4.9353°W |
| Elevation M: | 155 |
| Elevation Min M: | 111 |
| Elevation Max M: | 237 |
| Area Km2: | 45.57 |
Châteauneuf-sur-Isère (in French ʃɑtonœf syʁ izɛʁ/; Occitan (post 1500);: label=[[Vivaro-Alpine dialect|Vivaro-Alpine]]|Chasteunuòu d'Isèra) is a commune in the Drôme department in southeastern France.
It was the birthplace of St. Hugh of Châteauneuf.