Balneário Barra do Sul is a city in the northern part of the Brazilian state of Santa Catarina. It lies in the country's southern region.
The city is one of several coastal municipalities along the Santa Catarina coast whose name combines "Balneário" (roughly, a bathing or resort place) with a local place name, a common naming pattern for seaside towns in this part of Brazil.
Beyond its location in northern Santa Catarina, the available source material provides no further details on its history, population, economy, or attractions.