Itatiba do Sul is a municipality in the state of Rio Grande do Sul, in southern Brazil. It is a small community, with an estimated population of 3,231 as of 2020.
The city is the birthplace of Luiz Baú, a serial killer who terrorized Erechim and the surrounding areas. Baú was arrested and sent to a psychiatric hospital in Porto Alegre, where on June 30, 1980, he escaped along with four other inmates and has not been seen since.