Guanabara

Infobox Brazilian State
name = State of Guanabara

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motto =
anthem =

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capital = Rio de Janeiro
latd= |latm= |latNS= |longd= |longm= |longEW=
largest_city = Rio de Janeiro
demonym = carioca or guanabarino(a) ¹
leader_name1 = Antônio de Pádua Chagas Freitas
leader_name2 =
area = 1.356
area_magnitude = 1 E11
area_rank =
population_estimate = 4.858.000
population_estimate_rank =
population_estimate_year = 1975
population_census =
population_census_year =
population_density = 3.135
population_density_rank =
GDP =
GDP_rank =
GDP_year =
GDP_per_capita =
GDP_per_capita_rank =
HDI =
HDI_rank =
HDI_year =
abbreviation = BR-GB
time_zone = BRT
utc_offset = -3
time_zone_DST = BRST
utc_offset_DST = -2
footnotes = ¹ Only used in official documents

The 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. It was named after the Guanabara Bay, which borders its Eastern coast.

In 1834, the city of Rio de Janeiro became a municipality and was elevated to imperial capital. 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.

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.