Ambassador Do Hung Viet presented his credentials to UN Secretary-General Antonio Guterres on 20 June 2025, formally assuming his post as Permanent Representative of Viet Nam to the United Nations.  

Prior to this appointment, Ambassador Viet was Deputy Minister of Foreign Affairs since December 2022. He oversaw Viet Nam’s relations with South East Asian, East Asian and South-Pacific countries. His portfolio also included Viet Nam’s multilateral diplomacy efforts, particularly within the framework of the United Nations and ASEAN. He was Viet Nam’s ASEAN SOM Leader and oversaw Viet Nam’s engagement in the development of ASEAN’s Plans of Action to Strengthen the implementation of the Treaty for the Southeast Asia Nuclear-Weapon-Free Zone (2023 – 2027). He served on the UN Secretary-General's Panel on Critical Energy Transition Minerals.    

Between 2019 and 2022, Viet was Director-General, then Assistant Foreign Minister and Director-General of the Department of International Organizations. In this capacity, he managed Viet Nam’s overall engagement in various multilateral fora, in particular the United Nations, in peace and security, sustainable development, and human rights issues. During the 2020-2021 period, Viet managed the Taskforce for Viet Nam’s membership in the United Nations Security Council. He oversaw Viet Nam’s engagement as a member of the IAEA Board of Governors for the term 2021-2023.  

He served as Special Assistant to the APEC 2017 Chair of the Senior Officials’ Meeting (SOM), during which he facilitated the negotiations of the 2017 APEC Leaders’ Declaration and Joint Ministerial Statement.  

Between 2013 and 2016, Viet was Counsellor, then Deputy Permanent Representative of Viet Nam to the United Nations in New York. He served as Vice Chair of the 53rd Session of the Commission for Social Development (CSocD), G77 Coordinator for the negotiations of the Ministerial Declaration of the first High-level Political Forum on Sustainable Development, and lead negotiator of Viet Nam for negotiations of the 2030 Agenda for Sustainable Development.  

Before joining the Permanent Mission in New York, Viet served as Deputy Director-General of the Department of International Organizations, Ministry of Foreign Affairs, during which he played a key role in advancing the “Delivering as One” initiative which has led to major reforms in the way the UN Country Team operates in Viet Nam. He was also heavily involved in the preparations for Viet Nam’s ratification of the Comprehensive Test Ban Treaty (CTBT), signing of the IAEA CSA Additional Protocol, as well as participation in the first Nuclear Security Summit (April 2010).  

He has a master degree in public and international law from Melbourne Law School, University of Melbourne, and a bachelor degree in international relations from the Institute for International Relations (now Diplomatic Academy of Viet Nam) in Ha Noi, Viet Nam. Viet took part in the 2005 UN Disarmament Fellowship Programme.  

He is married with three daughters.