| San Carlo | |
| Coordinates: | 43.0989°N 10.5869°W |
| Province: | Livorno (LI) |
| Comune: | San Vincenzo |
| Elevation M: | 174 |
| Population Total: | 256 |
| Population As Of: | 2011 |
| Postal Code: | 57027 |
| Area Code: | (+39) 0565 |
San Carlo is a village in Tuscany, central Italy, administratively a frazione of the comune of San Vincenzo, province of Livorno. At the time of the 2011 census its population was 256.
The village is about 62 km from Livorno and 5 km from San Vincenzo.