São João do Polêsine is a municipality in the state of Rio Grande do Sul, Brazil.

In this city there are outcrops with fossils.

Sauropodomorph dinosaur Buriolestes and dinosauromorph Ixalerpeton were found in the Carnian (Late Triassic) deposits.

The type species Ixalerpeton polesinensis was named after São João do Polêsine in 2016.

This geographical article relating to Rio Grande do Sul is a stub.