Jose Manuel Tadeo "Chel" Icasiano Diokno is a Filipino lawyer, educator, human rights advocate, and broadcaster. He serves as chairman of the Free Legal Assistance Group (FLAG), the founding dean of the De La Salle University College of Law, and the chairman of the Bantayog ng mga Bayani Foundation. He has served as a special counsel of the Senate Blue Ribbon Committee. He was a candidate for the Senate in 2019 and 2022. He also co-hosts radio programs such as Oras at Bayan on Veritas 846 and Rekta: Agenda ng Masa on DZRH and DZRH News Television.

The Free Legal Assistance Group (FLAG) is a nationwide organization of human rights lawyers in the Philippines. It was founded in 1974 by Sen. Jose W. Diokno, Lorenzo Tañada, J.B.L. Reyes, and Joker Arroyo during the martial law era under former President Ferdinand Marcos. It is the first and largest group of human rights lawyers established in the nation. They work on countering varied abuses against human rights and civil liberties. Its current chairman since 2003 is human rights attorney Chel Diokno, the founding dean of the De La Salle University Tañada-Diokno School of Law.