| Água Santa | |
| Settlement Type: | Municipality |
| Pushpin Map: | Brazil |
| Pushpin Map Size: | 250 |
| Pushpin Map Caption: | Location in Brazil |
| Coordinates: | -28.1667°N -54°W |
| Subdivision Type: | Country |
| Subdivision Type1: | Region |
| Subdivision Name: |  Brazil |
| Subdivision Name1: | South |
| Subdivision Name2: | Rio Grande do Sul |
| Leader Title: | Mayor |
| Leader Name: | Antônio Alfredo de Souza, PMDB |
| Established Title: | Founded |
| Established Date: | 1989 |
| Area Total Km2: | 291.792 |
| Population As Of: | 2020 [1] |
| Population Total: | 3,743 |
| Population Density Km2: | 13.7 |
| Timezone: | BRT |
| Utc Offset: | -3 |
| Elevation M: | 650 |
| Website: | http://www.aguasantars.com.br/site/ |
Água Santa (pronounced as /pt/,) is a municipality in the state of Rio Grande do Sul, Brazil.