| Type: | parish |
| Official Name: | São Jacinto |
| Region: | Centro |
| Cim: | Região de Aveiro |
| District: | Aveiro |
| Municipality: | Aveiro |
| Coordinates: | 40.663°N -8.728°W |
| Area Total: | 13.84 |
| Population As Of: | 2011 |
| Population Total: | 993 |
São Jacinto is a civil parish in the municipality of Aveiro, Aveiro District, Portugal. The population in 2011 was 993,[1] in an area of 13.84 km2.[2] It is situated between the Aveiro Lagoon and the Atlantic Ocean. The São Jacinto Dunes Natural Reserve lies north of the village.
São Jacinto has a warm-summer Mediterranean climate with warm, dry summers and mild, wet winters.