Publications
Stelios H. Gregoriou, LLM, FCIArb is a distinguished Greek lawyer and an LLM graduate from the London School of Economics. Currently, he serves as the Senior Partner and Managing Director of Gregoriou Law Firm, a leading legal practice in Athens, Greece, with over 35 years of establishment.
Stelios is a Fellow of the Chartered Institute of Arbitrators (FCIArb) and proudly chairs the newly established CIArb-Greece Chapter. He is also empanelled with several prestigious arbitration organisations, including the Vienna International Arbitration Centre (VIAC), World Intellectual Property Organisation (WIPO), Cyprus Arbitration and Mediation Centre (CAMC), Athens Mediation & Arbitration Organisation (EODID) and DELOS Dispute Resolution.
In his professional role, being fluent in both English and French, Stelios has successfully handled many significant arbitration cases, serving as either an arbitrator or counsel. These cases often involve complex corporate and commercial matters, especially in the areas of energy, competition, intellectual property and the enforcement of arbitration awards.
As a thought leader, Stelios contributes annually to publications such as the International Comparative Legal Guides (ICLG) and others on Greek arbitration and is involved in academia lectures on International Commercial Arbitration.
Additionally, Stelios is an Accredited Mediator appointed by the Greek Ministry of Justice and has successfully facilitated the resolution of numerous disputes. Notably, he settled a high-profile aviation crash case as the claimant counsel in a mediation mandated by a United States Federal Court.
Besides his ADR work, Stelios is a renowned litigator with a wealth of experience in high-profile trials, including appearances before the Supreme Court of Greece and the Council of State (Supreme Administrative Court of Greece). He specialises in complex cross-border corporate and commercial disputes, competition law, intellectual property and energy-related issues. Stelios has also represented clients in several critical cases before the European Court of Human Rights (ECHR).
An enthusiastic scholar of the International Law of the Sea, Stelios presented a paper in 2019 at the annual London International Boundary Conference (organised by Volterra Law Firm) on ways to resolve the Greek-Turkish maritime delimitation dispute under UNCLOS provisions. In 2021, he discussed the legal role of the islands in the maritime zones delimitation at an Athens Bar Conference on the Greek borderline island, Kastellorizo.
A respected speaker, Stelios in 2024, presented for the second consecutive year at the Southeast Europe Arbitration (SEEA) Conference in Vienna, this time on the principles and methods of calculating damages in international arbitration. In the same year he also shared insights at the 2nd Edition of the Cyprus Arbitration Days (CAD) in Larnaca on the new Greek Arbitration Law, emphasising Greece’s potential as an attractive arbitration centre.
Lastly, in 2025 in Athens, as the Chair of CIArb Greece Chapter, he co-hosted the event Darwinism in ADR with the CIArb EU Branch.
Author of the Greece chapter in the Arbitration Law Guide , published 3 June 2025 .