| La Fontaine-Saint-Martin | |
| Commune Status: | Commune |
| Arrondissement: | La Flèche |
| Canton: | Le Lude |
| Insee: | 72135 |
| Postal Code: | 72330 |
| Mayor: | Christophe Libert[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Pays Fléchois |
| Coordinates: | 47.7908°N 0.0489°W |
| Elevation Min M: | 49 |
| Elevation Max M: | 100 |
| Area Km2: | 13.72 |
| Demonym: | Fontainois, Fontainoise |
La Fontaine-Saint-Martin (pronounced as /fr/) is a commune in the Sarthe department in the region of Pays de la Loire in north-western France.