Ramón Diokno y Marasigan (March 28, 1886 – April 21, 1954) was a Filipino statesman, jurist, Associate Justice, and one of the foremost nationalists of his generation. He fought the American Parity Rights Amendment and was one of four senators to be ousted so that the amendment may be ratified. He later became Associate Justice under Ramon Magsaysay but had the shortest term when he died two months and eleven days later.^[1] He is the father of former Senator Jose W. Diokno, the father of human rights and founder of the Free Legal Assistance Group (FLAG), and grandfather of Atty. Jose Manuel Tadeo "Chel" Diokno, the dean of the De La Salle University (DLSU) Tañada-Diokno College of Law. Justice Diokno is famous for writing the ponencia in the Re: Cunanan case.

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The Honorable Ramón M. Diokno
Associate Justice of the Supreme Court of the Philippines
In office February 10, 1954 – April 21, 1954
Appointed by	Ramon Magsaysay
Succeeded by	J. B. L. Reyes
Senator of the Philippines
In office May 25, 1946 – December 30, 1949
Member of the House of Representatives of the Philippine Islands from Batangas's 1st district
In office February 18, 1933 – September 16, 1935
Preceded by	Antonio de las Alas
Succeeded by	Natialio López
In office October 16, 1916 – June 3, 1919
Preceded by	Galicano Apacible
Succeeded by	Vicente Lontoc
Personal details
Born	Ramón Diokno y Marasigan (1886-03-28)March 28, 1886 Taal, Batangas, Captaincy General of the Philippines
Died	April 21, 1954(1954-04-21) (aged 68) Baguio, Philippines
Political party	Nacionalista (1916-1954)
Spouse(s)	Martha Fello Leonor Wright
Children	13, including Jose
Alma mater	Colegio de San Antonio de Padua

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Diokno was born in Taal, Batangas on March 28, 1886, as the only son to Ananías Diokno, head of the Visayan forces during the Philippine Revolution and Philippine–American War, and Paulina Marasigan. Diokno had four half-siblings from his father's second wife Emilia Rivera.^[2] Diokno's ancestor was the governor-general Felix Berenguer de Marquina, the namesake of Marikina City. Diokno received his primary instruction in Taal and continued his studies in a private school in Manila and in Colegio de San Antonio de Padua under Supreme Court Justice Ignacio Villamor.^[3]

Diokno was admitted to the practice of law in April 1905. While he was a student, he was the founding president of the Asociacion Escolar de Filipinas. He also founded the Colegio la Ilustracion and Rizal University, where he taught as a professor. He was editor of La Fraternidad and El Nacionalista, and was president of the Union del Trabajo de Filipinas and the Union de Marinus de Filipinas. He was a Mason at the Sinkuan Lodge and in charge of the Hilad Lodge, which he led for two years. He then influenced his son Jose "Ka Pepe" Diokno to join the Nilad Lodge No. 12. He was also one of the founders of the Gram Logia Regional de Filipinas.^[3]

He was also corporate counsel for the Philippine National Bank, Manila Railroad Company, Manila Hotel Company, National Loan and Investment Board, Metropolitan Water District, National Development Company, Cebu Portland Cement Company, and National Produce Exchange.^[3]

He won the special election for city councilor in the Northern District of Batangas in 1918 and in 1933. In the September 17, 1935 Commonwealth Election, he was the chief campaign manager of Manuel L. Quezon and was appointed Corporate Counsel.^[3]