Jose Manuel Tadeo "Chel" Icasiano Diokno[4][5] (Tagalog: [ˈdʒɔknɔ], born February 23, 1961)[4][6] is a Filipino lawyer, educator, human rights advocate, and broadcaster.

Chel Diokno passed the bar examination in the State of Illinois, USA, and subsequently in the Philippines.

In the 1990s, Diokno served in the Commission on Human Rights under Presidents Corazon Aquino and Fidel V. Ramos.

He was also a member of the Committee on Human Rights and Due Process at the Integrated Bar of the Philippines (IBP).

[13] Until 2019, Diokno served as the Presidential Adviser on Human Rights at the Integrated Bar of the Philippines and was a member of the Panel of Arbitrators at the International Centre for Settlement of Investment Disputes.

[24] In 2006, Diokno established the Diokno Law Center, which provides legal training to various agencies, including the Commission on Elections, the Public Attorney's Office, the Philippine National Police, the Office of the Ombudsman, the Bureau of Internal Revenue, the Bureau of Customs, and the Integrated Bar of the Philippines (IBP).

[25] In the 2019 Philippine general election, Diokno ran for a seat in the Senate under the Otso Diretso coalition, which opposed President Rodrigo Duterte's human rights record.

[30] On June 12, 2021, he was named among the six nominees of 1Sambayan, a coalition aiming to field a single candidate against President Duterte's successor in the 2022 Philippine presidential election.

He has also written news articles on forensic DNA, electronic evidence, anti-terrorism legislation, media law, and judicial reform.