São Mateus do Sul (St. Matthew of the South) is a municipality of the Brazilian state of Paraná, located in the southern region of the country.

It was the Lieutenant Bruno Costa Filgueiras, head of the Fourth Expedition, with 25 men, which was intended to Tibagi, who first popped in the lands of Sao Mateus do Sul in 1769.

In the year of 1890 headed by Sebastian Edmundo forerunner Celeste Woss Saporski, arrived at the 2.060 in number of 2000 families, establishing itself in colonies do Iguaçu, Canoes, Waterfall, Taquaral, White Water and Rio Claro (today municipality of Mallet).

With the end of the cycle of navigation of the Iguaçu River, in 1950, began a period of economic stagnation that struck the entire southern region.

São Mateus do Sul account today with more than 40.000 inhabitants, the majority descendant of Polish immigrants of the 19th century, being one of the 40 most populous cities in the state.

The water is abundant in the municipality, cut by Potinga and Iguaçu rivers, and bathed in the south by Negro, border with Santa Catarina.

The climate of the city is described as humid subtropical mesothermic, having its cool summers, mild winters with occurrence of severe and frequent frosts.

The industry ervateira is another important activity, demonstrating the interest of the market in grass-mate of the municipality, considered one of the greatest Brazilian producers, with 50% of its area of native forests and orchard, still preserved.