| Official Name: | Barra de Santo Antônio |
| Pushpin Map: | Brazil |
| Pushpin Map Caption: | Location in Brazil |
| Coordinates: | -9.405°N -35.5069°W |
| Subdivision Type: | Country |
| Subdivision Name: | Brazil |
| Subdivision Type1: | Region |
| Subdivision Name1: | Northeast |
| Subdivision Type2: | State |
| Subdivision Name2: | Alagoas |
| Subdivision Type3: | Mesoregion |
| Subdivision Type4: | Microregion |
| Subdivision Name4: | Maceió |
| Subdivision Type5: | Metrop. region |
| Leader Title: | Mayor |
| Area Total Km2: | 138.43 |
| Population Total: | 16,068 |
| Population As Of: | 2020 |
| Population Density Km2: | auto |
| Timezone1: | BRT |
| Utc Offset1: | -3 |
| Postal Code Type: | Postal code |
| Area Code Type: | Area code |
Barra de Santo Antônio is a municipality in the state of Alagoas in Brazil. The population is 16,068 (2020 est.)[1] in an area of 138.43 km².[2] The elevation is 10 m. It is situated on the Atlantic coast, northeast of Maceió.