| Olho d'Água do Casado | |
| Pushpin Map: | Brazil |
| Pushpin Map Caption: | Location in Brazil |
| Coordinates: | -9.536°N -37.294°W |
| Subdivision Type: | Country |
| Subdivision Name: | Brazil |
| Subdivision Type1: | Region |
| Subdivision Name1: | Northeast |
| Subdivision Type2: | State |
| Subdivision Name2: | Alagoas |
| Area Total Km2: | 323 |
| Population Total: | 9,441 |
| Population As Of: | 2020 |
| Timezone: | BRT |
| Utc Offset: | -3 |
Olho d'Água do Casado is a municipality located in the western of the Brazilian state of Alagoas. Its population is 9,441 (2020)[1] and its area is .[2]
The municipality holds part of the Rio São Francisco Natural Monument, which protects the spectacular canyons of the São Francisco River between the Paulo Afonso Hydroelectric Complex and the Xingó Dam.