| São Sebastião do Caí | |
| Settlement Type: | Municipality |
| Pushpin Map: | Brazil |
| Pushpin Mapsize: | 250 |
| Pushpin Map Caption: | Location in Brazil |
| Coordinates: | -29.5869°N -51.3758°W |
| Subdivision Type: | Country |
| Subdivision Name: |  Brazil |
| Subdivision Type1: | State |
| Subdivision Name1: | Rio Grande do Sul |
| Subdivision Type2: | Mesoregion |
| Subdivision Type3: | Microregion |
| Leader Title: | Mayor |
| Leader Name: | Julio Campani ((PSDB)) |
| Established Title: | Founded |
| Established Date: | May 1, 1875 |
| Total Type: | Total |
| Area Total Km2: | 111.452 |
| Population As Of: | 2020 [1] |
| Population Total: | 25,959 |
| Population Density Km2: | auto |
| Postal Code Type: | Postal code |
| Postal Code: | 95760-000 |
| Area Code Type: | Area/distance code |
| Area Code: | 51 |
| Blank Name Sec1: | IBGE code |
| Timezone: | BRT |
| Utc Offset: | -3 |
| Website: | http://www.saosebastiaodocai.com/ |
São Sebastião do Caí is a city near Porto Alegre in the Brazilian state of Rio Grande do Sul. It has a population of about 25,000 inhabitants. The principal university is the University of Caxias do Sul, often abbreviated as UCS. Through the middle of the city runs the river Caí, whose source is in the mountains of São Francisco de Paula, and which empties into Guaíba Lake. The city was founded on May 1, 1875. Like many towns in the state which were settled by German-speaking Europeans in the 19th century, the German language is still present in daily family and community life, if not as much in the public sphere since World War II.