1990 in Brazil

President:
- José Sarney (until March 14)
- Fernando Collor de Mello (starting March 15)
Vice President:
- Vacant (until March 14)
- Itamar Franco (starting March 15)

Acre: Édison Simão Cadaxo
Alagoas: Moacir Andrade
Amazonas:
- Amazonino Mendes (until April 2)
- Vivaldo Barroso Frota (from April 2)^[1]
Bahia: Nilo Moraes Coelho
Ceará: Tasso Jereissati^[2]
Espírito Santo: Max Freitas Mauro
Goiás: Henrique Santillo
Maranhão:
- Epitácio Cafeteira (until April 3)
- João Alberto de Souza (from April 3)^[3]
Mato Grosso: Edison de Oliveira
Mato Grosso do Sul: Marcelo Miranda Soares
Minas Gerais: Newton Cardoso^[4]
Pará: Hélio Gueiros
Paraíba: Tarcísio Burity
Paraná: Alvaro Dias
Pernambuco: Joaquim Francisco Cavalcanti
Piauí: Alberto Silva
Rio de Janeiro: Moreira Franco
Rio Grande do Norte: Geraldo José Ferreira de Melo
Rio Grande do Sul:
- Pedro Simon (until April 2)
- Sinval Sebastião Duarte Guazzelli (from April 2)
Rondônia: Jerônimo Garcia de Santana
Roraima: Rubens Vilar
Santa Catarina:
- Pedro Ivo Campos (until February 27)
- Casildo Maldaner (from February 27)
São Paulo: Orestes Quércia
Sergipe: Antônio Carlos Valadares
Tocantins: José Wilson Siqueira Campos

Acre:
- Edison Simão Cadaxo (until April 2)
- Vacant thereafter (from April 2)
Alagoas: vacant
Amazonas:
- Vivaldo Barros Frota (until April 2)
- Vacant thereafter (from April 2)
Bahia: Vacant
Ceará: Francisco Castelo de Castro
Espírito Santo: Carlos Alberto Batista da Cunha
Goiás: Joaquim Domingos Roriz
Maranhão:
- João Alberto Souza (until April 2)
- Vacant thereafter (from April 2)
Mato Grosso:
- Edison de Oliveira (until April 2)
- Vacant thereafter (from April 2)
Mato Grosso do Sul: George Takimoto
Minas Gerais: Júnia Marise de Azeredo Coutinho
Pará: Hermínio Calvinho Filho
Paraíba: Vacant
Paraná: Ary Veloso Queiroz
Pernambuco:
- Carlos Wilson Rocha de Queirós Campos (until April 2)
- Vacant thereafter (from April 2)
Piauí: Lucídio Portela Nunes
Rio de Janeiro: Francisco Amaral
Rio Grande do Norte: Garibaldi Alves
Rio Grande do Sul:
- Sinval Sebastião Duarte Guazzelli (until 2 April)
- Vacant thereafter (from April 2)
Rondônia: Orestes Muniz Filho
Santa Catarina:
- Casildo João Maldaner (until April 2)
- Vacant thereafter (from April 2)
São Paulo:
- Almino Afonso (until April 2)
- Vacant thereafter (from April 2)
Sergipe: Benedito de Figueiredo
Tocantins: Darci Martins Coelho

March 15: Fernando Collor de Mello is sworn in as the 32nd President of Brazil and becomes the youngest president in Brazilian history.^[5]

April 3: The National Congress of Brazil approves the first measures of the Collor Plan.^[6]

July 25: President Collor de Mello signs the Heinous Crimes Law, which increases the penalties for kidnapping, trafficking, rape, and other crimes.^[7]
July 26: Eleven people, who were residents of the Acari favela, are kidnapped by six armed men in the so-called Acari Massacre.^[8]

November 30: The country's first cell phone system is inaugurated by the Minister of Infrastructure, Ozires Silva, in the South Zone of Rio de Janeiro.^[9]

December 16: Darcy Alves Pereira and Darly Alves da Silva are sentenced to 19 years in prison for the murder of rubber tapper Chico Mendes.^[10]

Incumbents