| Type: | municipality |
| Official Name: | San Martín del Río |
| Pushpin Map: | Spain |
| Coordinates: | 41.0667°N -24°W |
| Area Total Km2: | 16 |
| Elevation M: | 781 |
| Population Density Km2: | auto |
| Utc Offset: | +1 |
| Utc Offset Dst: | +2 |
San Martín del Río is a municipality located in the province of Teruel, Aragon, Spain. According to the 2010 census[1] the municipality has a population of 199 inhabitants.
San Martín del Río is located in the Jiloca Comarca. There are Bronze Age archaeological remains in nearby Cerro del Zorro site.