Piratini may refer to:
Piratini (city), in Rio Grande do Sul, Brazil Piratini River (São Gonçalo Channel), a river in Brazil Piratini River (Uruguay River tributary), a river in Brazil Piratini-class patrol boat, a class of Brazilian Navy boats Piratini Palace, the seat of Rio Grande do Sul government in Porto Alegre TV Piratini, a television station in Porto Alegre Piratini Republic (1836–1845), a historical state in today's Brazil