Oonagh Sands

Senior Associate


Oonagh Sands is a dually-qualified English and US-lawyer.

She has significant experience representing sovereign States and their State-owned entities, as well as private individuals and entities, before leading world dispute resolution fora. She has represented clients before the International Court of Justice, the Permanent Court of Arbitration, as well as investor-State arbitral tribunals constituted under ICSID, ICSID Additional Facility, UNCITRAL, SCC and ICC rules. In addition, Oonagh has counselled States on the law of sovereign immunity, territorial and maritime boundary disputes, as well as issues arising under the law of the sea. In 2018, The American Society of International Law appointed Oonagh to serve on the steering committee for its signature topic “Beyond National Jurisdiction: Human Activities in the Oceans, Polar Regions, Cyberspace and Outer Space”, following her tenure as elected Co-Chair of the Society’s ‘Space Law Interest Group’.

Prior to joining Fietta, Oonagh worked at major law firms in Washington DC and London. Oonagh has also worked for the United Nations Office of Legal Affairs in New York, the European Commission in Brussels, and the Institute of International Economic Law at Georgetown University Law Center in Washington DC.

She speaks French and Spanish.

In 2016, Oonagh was recognised by The Irish Times for women’s influence in global public affairs.

Oonagh’s full curriculum vitae is available here.