Constantina, Rio Grande do Sul is a municipality in the state of Rio Grande do Sul, Brazil. Founded April 14, 1959. The municipality's motto is "Celeiro da Hospitalidade", meaning "Barn Hospitality".
It is a municipality that is part of the microregion of Frederico Westphalen. It is located at latitude 27ú44'05 "South and longitude 52ú59'32" West, with an altitude of 501 meters.
It has an area of 278.54 km<sup>2</sup> and its estimated population in 2020 was 9,907 inhabitants.