Mario Oyarzabal

Argentine Ambassador to the Netherlands and representative to the international organisations and tribunals in The Hague

Member of the United Nations International Law Commission

Membre associé de l’Institut de Droit international

Former Legal Adviser to the Argentine Foreign Ministry

United Nations Security Council — 2014

Mario Oyarzábal is the Ambassador of the Argentine Republic to the Kingdom of the Netherlands since 2020, as well as the Permanent Representative to the Organisation for the Prohibition of Chemical Weapons (OPCW). He also represents Argentina before the International Court of Justice (ICJ), the Permanent Court of Arbitration (PCA), the International Criminal Court (ICC), the Hague Conference on Private International Law (HCCH) and the Common Fund for Commodities (CFC).

A career diplomat with the Argentine foreign service since 1997, Ambassador Oyarzábal served as The Legal Adviser to the Argentine Ministry of Foreign Affairs between 2016 and 2020, and previously as an Assistant Legal Advisor between 2007 and 2011. He was the Argentine Commissioner to the International Whaling Commission (IWC) from 2016 to 2020, Deputy Permanent Representative of Argentina before the United Nations Security Council from 2013 to 2014, the Lead negotiator for Argentina on the United Nations General Assembly Resolution 69/319 on the Basic Principles on Sovereign Debt Restructuring Processes in 2015, and Deputy Consul of Argentina in New York from 1998 to 2007. He has acted as Head of Delegation and Delegate of Argentina to meetings of the Sixth Committee of the United Nations General Assembly, the International Seabed Authority (ISA), the International Maritime Organization (IMO), the Hague Conference on Private International Law (HCCH), the International Institute for the Unification of Private Law (UNIDROIT), the United Nations Commission on International Trade Law (UNCITRAL) and the Seventh Inter-American Conference on Private International Law (CIDIP VII).






  • Spanish (native), English and French (fluent), Italian and Portuguese (read).