Petrópolis (Portuguese: [peˈtɾɔpolis, -pu-]) is a municipality in the Southeast Region of Brazil. It is located in the state of Rio de Janeiro, 68 kilometres (42 mi) northeast of the city of Rio de Janeiro. According to the 2022 Brazilian census, Petrópolis municipality had a population of 278,881 inhabitants. Besides being the largest and most populous city in the Fluminense Mountain Region, the city also has the largest Gross Domestic Product and Human Development Index in the region.
The town's name ("City of Peter") honors Pedro II, the last Emperor of Brazil, who is entombed there at the Cathedral of Saint Peter of Alcantara. The city was the summer residence of the Brazilian Emperors and aristocrats in the 19th century, and was the official capital of the state of Rio de Janeiro during the First Brazilian Republic, between 1894 and 1902.