Ronan O'Reilly

Associate, London



Ronan is an associate in the Firm's Dispute Resolution group in London. His practice involves both commercial litigation and international arbitration and covers a variety of sectors including energy, telecommunications, mining, and financial services. He has represented a broad range of clients, including states and large corporations in complex disputes before the English courts and international tribunals under the rules of the major arbitral institutions (ICC, LCIA, SCC, ICSID, UNCITRAL and LMAA).  Ronan is the current Chair of the CIArb Global Young Members Group.

Bars and Courts
England and Wales
Trinity College Dublin
London School of Economics


Representing claimants in an ICSID arbitration under the DR-CAFTA arising from their investments in the mining industry. (Daniel W. Kappes and Kappes, Cassiday & Associates v. Guatemala)

Representing a Ukrainian lender in a LCIA arbitration relating to a contractual debt claim.

Acting for a Middle Eastern telecoms company in the successful defence of an ICC arbitration brought by a UK company.

Acting for a state in the successful defence of an ICC arbitration brought by a Chinese investor in connection with a digital broadcasting project.

Representing a subsidiary of a state-owned bank in an ICC arbitration in relation to a total return swap entered into with a Bulgarian counterparty.

Representing a global real estate investor in multi-jurisdictional enforcement proceedings against an Indian real estate developer in respect of two LCIA arbitration awards.

Acting for a European energy provider in an arbitration concerning the construction and design of a nuclear power plant.

Providing litigation support to a foreign government in connection with its sovereign debt-restructuring programme.

Acting for a US-based hedge fund in relation to a dispute concerning the termination of ISDA Master Agreements.

Acting for a specialist sub-contractor in litigation before the Technology and Construction Court concerning a dispute over the construction of a government building.

Speaking Engagements

Debate: "The Tribunal shall have the powers not only expressly granted by the Parties" - March 2019, Ukrainian Arbitration Association conference, Kiev.

Panel discussion: "The rules of privilege in international arbitration" – March 2017, CIArb YMG conference, Dubai.

The Future of Investment Treaty Arbitration – November 2015, moderator for panel discussion at the CIArb (Young Members Group) Centenary Celebration Conference held at the ICC, Paris

An Overview of English Law on Mergers and Acquisitions - February 2014, guest lecture at University College London


EAT aims to end dispute over without prejudice rule - Emp. L.J. 2014, 148 (Mar), 22-24 (co-author)