| São Fidélis | |
| Settlement Type: | Municipality |
| Official Name: | The Municipality of São Fidélis |
| Motto: | Cidade Poema |
| Mapsize: | 250px |
| Pushpin Map: | Brazil |
| Subdivision Type: | Country |
| Subdivision Type1: | Region |
| Subdivision Type2: | State |
| Subdivision Name: |  Brazil |
| Subdivision Name2: | Rio de Janeiro |
| Population As Of: | 2020 [1] |
| Population Total: | 38,710 |
| Timezone: | BRT |
| Utc Offset: | -3 |
| Coordinates: | -21.6458°N -41.7469°W |
São Fidélis (pronounced as /pt/) is a municipality located in the Brazilian state of Rio de Janeiro. Its population was 38,710 (2020) and its area is 1,028 km2.[2]
The municipality contains part of the Desengano State Park, created in 1970.