Vitit Muntarbhorn (born 1952) (Thai: วิทิต มันตาภรณ์, RTGS: Withit Mantaphon) is an international human rights expert and professor of law at Chulalongkorn University in Bangkok, Thailand.

[1][2] Muntarbhorn was designated in September 2016 as the first UN Independent Expert on violence and discrimination based on sexual orientation and gender identity by the Human Rights Council before succeeded by Victor Madrigal-Borloz in 2018.

Muntarbhorn, born in November 1952, was educated at Oxford and Free University of Brussels, and was called to the Bar in England before going on to lecture in law at various universities in Austria, Canada, Denmark, England, France, Switzerland and Thailand.

[5] Muntarbhorn remains involved in various UN activities, principally as a member of the Committee of Experts on the Application of Conventions and Recommendations of the International Labour Organization, and has served as an expert or consultant with the OHCHR, UNHCR, UNDP, FAO, UNICEF, UNESCO, the WHO and the United Nations University.

[7] Professor Vitit Muntarbhorn was appointed as the Special Rapporteur on the situation of human rights in Cambodia in March 2021.