Heraldo Muñoz Valenzuela (born July 22, 1948) is a Chilean political scientist, academic, diplomat and politician; the former Minister of Foreign Affairs of Chile under President Michelle Bachelet; former Assistant Secretary General, Assistant Administrator, and Regional Director for Latin America and the Caribbean of the United Nations Development Programme; and the former Chilean Ambassador to the United Nations, to Brazil, and to the Organization of American States.

After the first year, he left to major in political science at the State University of New York (SUNY), Oswego, thanks to a scholarship from the Institute of International Education.

[2] During the administration of Eduardo Frei Ruiz-Tagle, Muñoz served as Ambassador to Brazil (1994-1998); during this mission, he participated in negotiations to end hostilities between Peru and Ecuador.

[4] In February 2009, Secretary-General Ban Ki-moon appointed him as head of a UN Commission of Inquiry to investigate the assassination of former Prime Minister of Pakistan Benazir Bhutto, in response to a request made by Pakistani President Asif Ali Zardari.

[5] The report of the findings of the Commission, delivered in April 2010, resulted in the reopening of the case in the courts of Pakistan and the subsequent arrests of several high level individuals.

[7] As Chairman of the Peacebuilding Commission, in 2009 he obtained a donation of the funds collected through author's rights from a new digital version of John Lennon's song, "Give Peace a Chance" by his widow, artist Yoko Ono.

Likewise during Muñoz's tenure, the Foreign Ministry elaborated a National Action Plan for Human Rights and Business, which was presented to President Bachelet in 2017.

[13] Also that year, Venezuela's political opposition to the government of Nicolás Maduro requested that Muñoz represent them, along with Foreign Minister of Mexico Luis Videgaray Caso, in negotiations held in the Dominican Republic, to set conditions for the then upcoming presidential elections: these efforts were eventually unsuccessful due to the intransigence of Venezuelan authorities and disagreements within the opposition.