| Official Name: | Riacho de Santo Antônio |
| Settlement Type: | Municipality |
| Pushpin Map: | Brazil |
| Pushpin Map Caption: | Location in Brazil |
| Coordinates: | -7.6833°N -45°W |
| Subdivision Type: | Country |
| Subdivision Name: | Brazil |
| Subdivision Type1: | Region |
| Subdivision Name1: | Northeast |
| Subdivision Type2: | State |
| Subdivision Name2: | Paraíba |
| Subdivision Type3: | Mesoregion |
| Subdivision Type4: | Microregion |
| Subdivision Name4: | Cariri Oriental |
| Subdivision Type5: | Metrop. region |
| Leader Title: | Mayor |
| Area Total Km2: | 91.32 |
| Population Total: | 1,974 |
| Population As Of: | 2020 [1] |
| Population Density Km2: | auto |
| Timezone1: | BRT |
| Utc Offset1: | -3 |
| Postal Code Type: | Postal code |
| Postal Code: | 58465-xxx |
| Area Code Type: | Area code |
| Area Code: | +55-83 |
Riacho de Santo Antônio is a municipality in the state of Paraíba in Brazil. The population is 1,974 (2020 est.) in an area of 91.32 km².