| San Martín | |
| Settlement Type: | Locality |
| Pushpin Map: |
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| Pushpin Label: | San Martín |
| Pushpin Label Position: | left |
| Subdivision Type: | Country |
| Subdivision Type1: | Autonomous community |
| Subdivision Type2: | Province |
| Subdivision Name2: | Province of Huesca |
| Subdivision Type3: | Municipality |
| Subdivision Name3: | Arén |
| Population Total: | 4 |
| Coordinates: | 42.3044°N 0.6725°W[1] |
| Elevation M: | 954 |
| Postal Code Type: | Postal code |
San Martín is a locality located in the municipality of Arén, in Huesca province, Aragon, Spain. As of 2020, it has a population of 4.[2]