San Martín del Río

Infobox City
official_name = San Martín del Río, Spain | nickname = |
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| map_caption = | subdivision_type = Country | subdivision_name = Spain | subdivision_type1 = Autonomous community | subdivision_name1 = Aragon | subdivision_type2 = Province | subdivision_name2 = Teruel | subdivision_type3 = Municipality | subdivision_name3 = San Martín del Río | leader_title = | leader_name = | area_magnitude = | area_total_km2 = 16 | area_land_km2 = | area_water_km2 = | elevation_m = | population_as_of = 2004 | population_note = | population_total = 255 | population_density_km2 = 15.9 | timezone = CET | utc_offset = +1 | timezone_DST = CEST | utc_offset_DST = +2 | latitude = | longitude = | website = | footnotes = |

San Martín del Río is a municipality located in the province of Teruel, Aragon, Spain. According to the 2004 census (INE), the municipality has a population of 255 inhabitants.

Location map |Spain
lat_dir = N
lat_deg = 41
lat_min = 4
lon_dir = W
lon_deg = 1
lon_min = 23
float = left
caption=