| Official Name: | City of Alegrete |
| Nickname: | "Baita Chão" ("Hell of a Ground") |
| Leader Name: | Márcio Amaral |
| Established Title: | Founded |
| Established Date: | 25 October 1831 |
| Area Total Km2: | 7,804 |
| Population As Of: | 2020 [1] |
| Population Total: | 73,028 |
| Population Density Km2: | auto |
| Utc Offset: | -3 |
| Coordinates: | -29.7838°N -55.791°W |
| Elevation M: | 102 |
| Blank Name: | HDI (2000) |
| Blank Info: | 0.793 – [2] |
| Website: | alegrete.rs.gov.br |
Alegrete (pronounced as /pt/) is a municipality in Rio Grande do Sul located in southern Brazil. Its medium altitude is 102m (335feet). Its estimated population in 2020 was 73,028 inhabitants and the total area is 7803.967km2 (the largest municipality of the State and of Southern Brazil). Its inhabitants are called Alegretenses.
Alegrete was settled in 1816 and became a municipality in 1857. It is the hometown of the abolitionist leader Franklin Gomes Souto, of the politician, diplomat and statesman Osvaldo Aranha, first President of the United Nations General Assembly, and of the Brazilian poet Mário Quintana. Every 20 September (Ragamuffin War Day), about 8,000 young, adult and old horsemen and horsewomen parade through its streets, using their native costumes and riding their horses with trappings.
Alegrete is served by Gaudêncio Machado Ramos Airport.
The municipality contains part of the Ibirapuitã Biological Reserve, a fully protected conservation unit created in 1982 to preserve an area of the pampas biome.