| San Martino Alfieri | |
| Official Name: | Comune di San Martino Alfieri |
| Native Name: | San Martin |
| Coordinates: | 44.8167°N 15°W |
| Region: | Piedmont |
| Province: | Province of Asti (AT) |
| Frazioni: | Firano, Saracchi, Quaglia, Marelli, Fagnani |
| Mayor: | Michele Ruella |
| Area Total Km2: | 7.4 |
| Population Total: | 726 |
| Population As Of: | 31 May 2007[1] |
| Population Demonym: | Sanmartinesi |
| Postal Code: | 14010 |
| Area Code: | 0141 |
San Martino Alfieri (pms|San Martin) is a comune (municipality) in the Province of Asti in the Italian region Piedmont, located about 45km (28miles) southeast of Turin and about 11km (07miles) southwest of Asti.
San Martino Alfieri borders the following municipalities: Antignano, Costigliole d'Asti, Govone, and San Damiano d'Asti.
The town is partially named after .