Pugwash Conferences on Science and World Affairs
Sérgio de Queiroz Duarte (b. 1934) is a retired Brazilian career diplomat. His last position was as United Nations High Representative for Disarmament Affairs, with the United Nations Office for Disarmament Affairs. He was appointed by UN Secretary-General Ban Ki-moon in July 2007 and retired in February 2012. Duarte currently serves as President of the Pugwash Conferences on Science and World Affairs.