Mario Oyarzábal
- Nationality
- Argentina
- Year of election
- 2023
Function(s)
- Director General of International Legal Affairs and Legal Adviser to the Argentine Foreign Ministry
- Member of the United Nations International Law Commission
- Member of the Permanent Court of Arbitration
Area(s) of Expertise
- Public International Law
- Private International Law
- Human Rights Law
- Nationality
Biography
Ambassador Mario Oyarzábal is the principal Legal Adviser to the Argentine Ministry of Foreign Affairs since April 2025, having served in the same position between 2016 and 2020. He is also member of the International Law Commission (2023-2027), member of the Permanent Court of Arbitration, as well as arbitrator and conciliator nominated under Art. 2 of Annexes V and VII of UNCLOS.
A career diplomat, he was Ambassador to the Netherlands (2020-2025), and Deputy Permanent Representative before the United Nations Security Council (2013-2014).
He has appeared as agent and counsel before the ICJ and ITLOS.
He gave a special course at The Hague Academy of International Law in 2020 and has been invited to deliver the general course in 2029.
He holds a JD from the University of La Plata and an LLM from Harvard.
Selected publications
- Derecho internacional público para diplomáticos argentinos (co-editor), APSEN/CARI, Buenos Aires, 2025
- Derecho internacional privado para diplomáticos, APSEN/CARI, Buenos Aires, 2024
- “The Influence of Public International Law upon Private International Law in History and Theory and in the Formation and Application of the Law”, Recueil des cours de l’Académie de droit international de La Haye, Vol. 428, 2023, pp. 129 et seq.
- Derecho procesal transnacional (editor), Ábaco, Buenos Aires, 2012
- La nacionalidad argentina, La Ley, Buenos Aires, 2003
- El Contrato de seguro multinacional, Ábaco, Buenos Aires, 1998
