State of Guanabara (in Portuguese: Estado da Guanabara), was the name given to the municipality of Rio de Janeiro (now the city with the same name), after the moving of the national capital to Brasília in 1960.
In 1834, the city of Rio de Janeiro became a municipality and was elevated to provincial capital by the Ato Adicional. With the proclamation of the republic in 1889, the city of Rio de Janeiro became the Federal District, and the province of Rio de Janeiro became a State with Niterói as the State capital. With the moving of the national capital to Brasília in 1960, the municipality of Rio de Janeiro became the State of Guanabara. Finally in 1975, the states of Guanabara and Rio de Janeiro merged under the name of Rio de Janeiro, with the city of Rio de Janeiro as state capital.