The Paço Imperial, or Imperial Palace, previously known as the Royal Palace of Rio de Janeiro and Palace of the Viceroys, is a historic building in the center of the city of Rio de Janeiro, Brazil. The Paço Imperial was built in the 18th century to serve as a residence for the governors of colonial Brazil. From 1808, it was used as a royal residence by King John VI of Portugal as King of Portugal and later also as King of Brazil. In 1822 it became the city palace of the monarchs of the Empire of Brazil, Pedro I and Pedro II, who used it not as a residence, but as a workplace. It was one of the main political centers of Brazil for nearly 150 years, from 1743 to 1889.
The Paço Imperial is located in the Praça XV de Novembro in central Rio. Due to its architectural and historical significance, it is one of Brazil's most important historic buildings. Today it serves as a cultural center.