1966 in Brazil

Incumbents

Federal government

• President: Marshal Castelo Branco
• Vice President: José Maria Alkmin

  Governors

• Acre:
• :pt:Lista de governadores de Alagoas|Alagoas:
• Amazonas:
• Bahia:
• Ceará:
• Espírito Santo:
• :pt:Lista de governadores de Goiás|Goiás:
• Maranhão:
• Mato Grosso:
• Minas Gerais:
• :pt:Lista de governadores do Pará|Pará:
• :pt:Lista de governadores da Paraíba|Paraíba:
• Paraná:
• :pt:Lista de governadores de Pernambuco|Pernambuco:
• :pt:Lista de governadores do Piauí|Piauí:
• Rio Grande do Norte:
• Rio Grande do Sul:
• :pt:Lista de governadores de Santa Catarina|Santa Catarina:
• São Paulo:
• :pt:Lista de governadores de Sergipe|Sergipe:

  Vice governors

• :pt:Lista de vice-governadores de Alagoas|Alagoas:
• :pt:Lista de vice-governadores da Bahia|Bahia:
• :pt:Lista de vice-governadores do Ceará|Ceará:
• :pt:Lista de vice-governadores do Espírito Santo|Espírito Santo:
• :pt:Lista de vice-governadores de Goiás|Goiás:
• :pt:Lista de vice-governadores de Mato Grosso|Mato Grosso:
• :pt:Lista de vice-governadores de Minas Gerais|Minas Gerais:
• :pt:Lista de vice-governadores do Pará|Pará:
• :pt:Lista de vice-governadores da Paraíba|Paraíba:
• :pt:Lista de vice-governadores do Paraná|Paraná:
• :pt:Lista de vice-governadores de Pernambuco|Pernambuco:
• :pt:Lista de vice-governadores do Piauí|Piaui:
• :pt:Lista de vice-governadores do Rio Grande do Norte|Rio Grande do Norte:
• :pt:Lista de vice-governadores de Santa Catarina|Santa Catarina:
• :pt:Lista de vice-governadores de São Paulo|São Paulo:

  Events

• 5 February – Institutional Act Number Three is issued. It introduces indirect elections for governors and vice-governors and the appointment of mayors.
• 21 February – Pelé marries Rosemeri dos Reis Cholbi.
• 5 June – Adhemar de Barros, governor of São Paulo, is removed from the post and has his political rights revoked by president Castelo Branco.
• 6 June – Luís Carlos Prestes, leader of the Brazilian Communist Party, is sentenced to 14 years in prison.
• 25 July – A bomb attack attempting to assassinate presidential candidate Artur da Costa e Silva at Recife International Airport causes 3 deaths and several wounds.
• 20 August – The Lead Masks Case – the corpses of two electronic technicians wearing lead masks are found near Rio de Janeiro in advanced state of decomposition. The case of their death has never been determined and was subject to much speculation.
• 3 October – An indirect presidential election takes place. Artur Costa e Silva is elected the next President of Brazil by 295 congress votes.

  Births

• 12 July – Mendonça Filho, ex-governor of Pernambuco

  Deaths

• 15 May – Venceslau Brás, 98, 9th President of Brazil