| Mareil-sur-Loir | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Mareil-sur-Loir (Sarthe).svg |
| Arrondissement: | La Flèche |
| Canton: | La Flèche |
| Insee: | 72185 |
| Postal Code: | 72200 |
| Mayor: | Jérôme Prémartin[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Pays Fléchois |
| Coordinates: | 47.715°N 0.012°W |
| Elevation Min M: | 28 |
| Elevation Max M: | 102 |
| Area Km2: | 12 |
| Demonym: | Mareillais, Mareillaise |
Mareil-sur-Loir (pronounced as /fr/, literally Mareil on Loir) is a commune in the Sarthe department in the region of Pays de la Loire in north-western France.