| Official Name: | Santo Antônio da Alegria |
| Settlement Type: | Municipality |
| Pushpin Map: | Brazil |
| Pushpin Map Caption: | Location in Brazil |
| Coordinates: | -21.0869°N -47.1511°W |
| Subdivision Type: | Country |
| Subdivision Name: | Brazil |
| Subdivision Type1: | Region |
| Subdivision Name1: | Southeast |
| Subdivision Type2: | State |
| Subdivision Name2: | São Paulo |
| Subdivision Type3: | Mesoregion |
| Subdivision Type4: | Microregion |
| Subdivision Type5: | Metrop. region |
| Subdivision Name5: | Ribeirão Preto |
| Leader Title: | Mayor |
| Leader Name: | Ricardo da Silva Sobrinho (2021/2024) |
| Elevation M: | 791 |
| Area Total Km2: | 310.29 |
| Population Total: | 6,977 |
| Population As Of: | 2020 [1] |
| Population Density Km2: | auto |
| Population Demonym: | Alegriense |
| Blank Name Sec1: | HDI |
| Timezone1: | BRT |
| Utc Offset1: | -3 |
| Postal Code Type: | Postal code |
| Postal Code: | 14390-xxx |
| Area Code Type: | Area code |
| Area Code: | +55-16 |
Santo Antônio da Alegria is a municipality in the northern part of the state of São Paulo in Brazil. The population is 6,977 (2020 est.) in an area of 310.29 km².[2] The elevation is 791 m. A neighboring municipality is São Sebastião do Paraíso in Minas Gerais to the northeast.