The Cathedral of Saint Peter of Alcantara, also known as the Cathedral of Petrópolis, is a Roman Catholic cathedral in Petrópolis, Brazil, dedicated to the city's patron saint, Peter of Alcantara. The cathedral is also the final resting place of the last Emperor of Brazil, Dom Pedro II, and his family.

Petrópolis, also known as The Imperial City, 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 2010 National Brazilian Census, Petrópolis municipality had 295,917 inhabitants that year, an increase from the 286,537 inhabitants at the previous census. Besides being the largest and most populous city in the Fluminense Mountain Region, the city also has the largest GDP and HDI in the region.