| Château-sur-Allier | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Château-sur-Allier 03.svg |
| Arrondissement: | Moulins |
| Canton: | Bourbon-l'Archambault |
| Insee: | 03064 |
| Postal Code: | 03320 |
| Mayor: | Jean-Luc Mosnier[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CA Moulins Communauté |
| Coordinates: | 46.7667°N 3.0297°W |
| Elevation M: | 187 |
| Elevation Min M: | 180 |
| Elevation Max M: | 233 |
| Area Km2: | 27.75 |
Château-sur-Allier (in French pronounced as /ʃɑto syʁ alje/) is a commune in the Allier department in central France.