| Château-du-Loir | |
| Arrondissement: | La Flèche |
| Canton: | Montval-sur-Loir |
| Insee: | 72071 |
| Postal Code: | 72500 |
| Commune: | Montval-sur-Loir |
| Coordinates: | 47.6983°N 0.4183°W |
| Elevation M: | 101 |
| Elevation Min M: | 44 |
| Elevation Max M: | 131 |
| Area Km2: | 11.46 |
| Population: | 4551 |
| Population Date: | 2019 |
| Population Footnotes: | [1] |
Château-du-Loir (in French pronounced as /ʃɑto dy lwaʁ/; literally 'Château of the Loir') is a former commune in the Sarthe department in the region of Pays de la Loire in north-western France. On 1 October 2016, it was merged into the new commune Montval-sur-Loir.[2] Château-du-Loir station has rail connections to Tours and Le Mans.