| Settlement Type: | municipality |
| Official Name: | Águas Mornas |
| Mapsize: | 250px |
| Subdivision Type: | Country |
| Subdivision Type1: | Region |
| Subdivision Type2: | State |
| Subdivision Name: |  Brazil |
| Subdivision Name1: | South |
| Subdivision Name2: | Santa Catarina |
| Leader Title: | Mayor |
| Leader Name: | Elmar Antônio Thiesen |
| Leader Party: | PFL |
| Established Title: | Founded |
| Established Date: | December 29, 1961 |
| Area Total Km2: | 360.757 |
| Pushpin Map: | Brazil |
| Population As Of: | 2020 [1] |
| Population Total: | 6,559 |
| Population Density Km2: | 12.4 |
| Timezone: | BRT |
| Utc Offset: | -3 |
| Coordinates: | -27.6939°N -48.8239°W |
| Elevation M: | 70 |
| Blank Name: | HDI (2000) |
| Blank Info: | 0.783 |
| Website: | www.aguasmornas.sc.gov.br |
Águas Mornas is a Brazilian municipality in the state of Santa Catarina.
The municipality contains part of the Rio das Lontras Private Natural Heritage Reserve, a fully protected area of montane rainforest in the Atlantic Forest biome.It also contains part of the Serra do Tabuleiro State Park, a protected area created in 1975.The lushly-forested park protects the sources of the Vargem do Braço, Cubatão and D'Una rivers, which supply most of the drinking water for greater Florianópolis and the south coast region.