| Official Name: | Formosa do Sul, Santa Catarina |
| Nickname: | Formosa |
| Settlement Type: | Municipality |
| Pushpin Label Position: | bottom |
| Pushpin Map Caption: | Location in Brazil |
| Subdivision Type: | Country |
| Subdivision Name: |  Brazil |
| Subdivision Name1: | South |
| Subdivision Type2: | State |
| Subdivision Name2: | Santa Catarina |
| Subdivision Type3: | Mesoregion |
| Subdivision Name3: | Oeste Catarinense |
| Leader Title: | Mayor |
| Leader Name: | Rudimar Conte (PT) |
| Unit Pref: | Imperial |
| Area Total Km2: | 100,105 |
| Population As Of: | 2020 [1] |
| Population Total: | 2,495 |
| Population Density Km2: | auto |
| Timezone: | UTC -3 |
| Postal Code: | 89859-000 |
| Area Code: | +55 49 |
Formosa do Sul is a Brazilian municipality in the state of Santa Catarina. The elevation is 500 m. The population in 2020 was 2,495. The area is 100 km².