| Baía Formosa | |
| Settlement Type: | Municipality |
| Official Name: | The Municipality of Baía Formosa |
| Mapsize: | 250px |
| Subdivision Type: | Country |
| Subdivision Type1: | Region |
| Subdivision Type2: | State |
| Subdivision Name: |  Brazil |
| Subdivision Name1: | Northeast |
| Subdivision Name2: | Rio Grande do Norte |
| Leader Title: | Mayor |
| Leader Name: | José Nivaldo Araújo de Melo |
| Established Title: | Founded |
| Established Date: | December 31, 1958 |
| Area Total Km2: | 245.510 |
| Population As Of: | 2020 [1] |
| Population Total: | 9,322 |
| Population Density Km2: | 33.7 |
| Timezone: | BRT |
| Utc Offset: | -3 |
| Coordinates: | -6.3689°N -35.0078°W |
| Blank Name: | HDI (2000) |
| Blank Info: | 0.643 – medium[2] |
Baía Formosa (lit. "beautiful bay") is the easternmost city in the Brazilian state of Rio Grande do Norte and the first coastal city (going south–north) of that state, lying near the border with Paraíba.
The municipality contains the 7897ha Mata da Estrela Private Natural Heritage Reserve.