| Terra Boa | |
| Settlement Type: | Municipality |
| Pushpin Map: | Brazil |
| Pushpin Mapsize: | 250 |
| Pushpin Map Caption: | Location in Brazil |
| Coordinates: | -29.5503°N -55.1311°W |
| Subdivision Type: | Country |
| Subdivision Name: |  Brazil |
| Subdivision Type1: | State |
| Subdivision Name1: | Rio Grande do Sul |
| Subdivision Type2: | Mesoregion |
| Subdivision Name2: | Southwestern Rio Grande do Sul (Sudoeste Rio-Grandense) |
| Subdivision Type3: | Microregion |
| Subdivision Name3: | Campanha Ocidental |
| Leader Title: | Mayor |
| Established Title: | Founded |
| Established Date: | January 4, 1884 |
| Total Type: | Total |
| Area Total Km2: | 2,503.9 |
| Population As Of: | 2020 [1] |
| Population Total: | 18,205 |
| Population Density Km2: | auto |
| Population Demonym: | Assissense |
| Postal Code Type: | Postal code |
| Postal Code: | 97610-xxx |
| Area Code Type: | Area/distance code |
| Blank Name Sec1: | IBGE code |
| Blank Info Sec1: | 4318101 |
| Timezone: | BRT |
| Utc Offset: | -3 |
| Elevation M: | 151 |
| Website: | saofranciscoassis.rs.gov.br |
São Francisco de Assis is a Brazilian municipality in the western part of the state of Rio Grande do Sul. It has a population of 18,205 (2020). Its elevation is 151 m. It has an area of 2,530.9 km². It is located 434 km west of the state capital of Porto Alegre. The nickname of the city is Sao Chico.
The city is situated by the Jaguari, near the city of Santa Maria. They plant soy and produce milk. The city had been showing significant growth, compared to the last decade.