Paranaguá (Great Round Sea, in Tupi) is a city in the state of Paraná in Brazil. Founded in 1648, it is Paraná's oldest city. It is known for the Port of Paranaguá, which serves as both the sea link for Curitiba, 110 km to the west and the capital of Paraná, and as one of the largest ports of Brazil.
As of 2020, the city has an estimated population of 156,174 and a population density of 169.92 persons per km², making it the tenth most populated city in the state of Paraná. The total area of the city is 826.674 km².
The municipality contains 4% of the 199587 ha Guaratuba Environmental Protection Area, created in 1992. It holds 17% of the 34179 ha Bom Jesus Biological Reserve, a strictly protected conservation unit established in 2012. The municipality contains the Ilha do Mel State Park and the Ilha do Mel Ecological Station on the 2760 ha Ilha do Mel (Honey Island) at the mouth of Paranaguá Bay.
