João Mangabeira
Minister of Justice and Internal Affairs
In office 24 January 1963 – 7 June 1963
President	João Goulart
Preceded by	Alfredo Nasser
Succeeded by	Carlos Molinari
Minister of Mines and Energy
In office 27 July 1962 – 18 September 1962
Prime Minister	Brochado da Rocha
Preceded by	Gabriel Passos
Succeeded by	Eliezer Batista
Federal Deputy for Bahia
In office 28 May 1947 – 12 March 1951
In office 9 July 1937 – 10 November 1937
In office 2 May 1935 – 21 March 1936
In office 15 May 1915 – 31 December 1929
In office 3 May 1909 – 31 December 1911
Senator for Bahia
In office 3 May 1930 – 11 November 1930
State Deputy of Bahia
In office 7 April 1906 – 7 April 1908
Personal details
Born	(1880-06-26)26 June 1880 Salvador, Bahia, Empire of Brazil
Died	27 April 1964(1964-04-27) (aged 83) Rio de Janeiro, Guanabara, Brazil
Political party	UDN (1945–1947) PSB (1947–1964)
Spouse	Constança Mangabeira
Parents	Francisco Cavalcanti Mangabeira (father) Augusta Cavalcanti Mangabeira (mother)
Alma mater	Free Faculty of Law of Bahia
Occupation	jurist politician writer

João Mangabeira (26 June 1880 – 27 April 1964) was a Brazilian jurist, politician and writer.

Mangabeira was the brother of medical doctor and poet Francisco Mangabeira, and politician Otávio Mangabeira. He was admitted to law school at 13 years of age, and despite belonging to a large family without financial resources, he managed to complete his course by the age of 17. He then began practicing law in Ilhéus, Bahia. According to Federal jurist and politician Paulo Brossard:

"When the annual session of the jury started, a poor defendant went on trial without a lawyer. The judge designated João Mangabeira as a defense lawyer. Mangabeira knew nothing about the process. Listening to the judge's report, he paid attention to everything: names, pages, details. As soon as the prosecutor concluded the indictment, the young defense lawyer, appointed minutes before, shattered the charge, pointing out contradictions, correcting names, indicating process pages that he did not handle at all. The defendant was acquitted ... and, thereafter, the city began to trust the lawyer who was no more than a child, and his office started to have clients."

Shortly after ^[when?] he became a congressman as a State Deputy and then as a Federal Deputy. He became a close associate of Rui Barbosa. In 1923, when Barbosa died, Mangabeira gave a speech in his honor. On the centenary of the birth of Barbosa in 1949, Mangabeira was the speaker of the House of Representatives.

In a short time he became one of the most prominent figures in the House of Representatives. Renowned as both congressman and lawyer, he came to be highly regarded for his intelligence.

Mangabeira's career included defending socialism. As deputy for the Constitutional Assembly of 1934, and his opposition to the Estado Novo dictatorship (Vargas Era) landed Mangabeira in prison for 15 months. "I'd rather get in jail by this dictatorship, than be free, agreeing with it," he said in 1936.