São Gonçalo is a municipality in Rio de Janeiro, Brazil, in the Southest region. It is located in the Metropolitan Region of Rio de Janeiro, having land limits with the municipalities of Niterói, Maricá and Itaboraí, and a maritime limit, by Guanabara Bay, with the capital, Rio de Janeiro. According to the 2022 census, it has a population of 896,744 inhabitants, making it the second most populous municipality in the state and the 18th most populous in the country.

The Southeast Region of Brazil is composed of the states of Espírito Santo, Minas Gerais, Rio de Janeiro and São Paulo. It is the richest region of the country, responsible for approximately 60% of the Brazilian GDP, as São Paulo, Rio de Janeiro, and Minas Gerais are the three richest states of Brazil, the top three Brazilian states in terms of GDP. The Southeast of Brazil also has the highest GDP per capita among all Brazilian regions.