O’Melveny Worldwide

International Disputes & Arbitration

With offices from Los Angeles to London, Hong Kong to Brussels, O’Melveny’s powerhouse dispute-resolution practice circles the globe.

With offices from Los Angeles to London, Hong Kong to Brussels, O’Melveny’s powerhouse dispute-resolution practice circles the globe.

Our elite litigation team is on the short list of firms that multinationals call when confronted with high-stakes disputes. Whether in North America, Asia, or Europe, we represent global companies in complex cases spanning continents and jurisdictions. Our interdisciplinary firm is designed to serve clients around the world, and we have an extensive record of success in dozens of international venues, from Japan’s Supreme Court to the London Court of International Arbitration and so much in between.

In London and throughout Asia, with litigation hubs in Hong Kong, Tokyo, and Seoul, we have a long track record of successfully handling and resolving disputes, both in the courts and through international arbitration. Our favorable results reflect our deep connections and roots in local geographies, and experience in these regions dating back more than three decades. Whether in courts in Tokyo, Hong Kong, or London, the Hong Kong International Arbitration Centre (HKIAC) or the International Chamber of Commerce, we are well-respected advocates in courtrooms worldwide and before international tribunals.

We handle disputes over M&A, joint ventures, shareholder complaints, sales and distribution agreements, insurance, financial services, construction, technology, and life sciences, to name a few. Our clients choose us because of the relationships we build, our technical and language skills, and our willingness and ability to understand their businesses.

We are respected outside the courtroom and tribunal as well. Denis Brock, Chair of our International Disputes and Arbitration Practice, is also the General Editor of the seminal textbook Commercial Arbitration: A Practical Guide, which is published for both Hong Kong and Singapore and co-edited by the Chief Justices of those jurisdictions.

Our work consistently earns attention and recognition. We were recently nominated in Benchmark Litigation’s Asia-Pacific Awards in three categories: “International Firm of the Year—Dispute Resolution,” “International Firm Lawyer of the Year—Denis Brock,” and “Rising Star of the region—Kieran Humphrey.” In 2022 Asia Legal Business shortlisted O’Melveny as “International Arbitration Law Firm of the Year” for Korea.

CFJ and Shinsei Financial

Advised these leading Japan financial institutions in more than 1,000 cases successfully litigated in Japan’s district courts, some of which were in the high courts, and a dozen in the Supreme Court.

Government of the Republic of Ecuador

We successfully represented the sovereign state in a commercial arbitration under the Hong Kong International Arbitration Centre rules.

Leighton Contractors (Asia)

Represented the company in Hong Kong’s largest and highest profile litigation in years, a dispute over construction of the US$10 billion Shatin-Central rail link. Leighton, the main contractor for a key section of the project, faced allegations of construction defects, but a Hong Kong commission of inquiry reached favorable findings for our client, determining that the structure satisfied safety standards.


Won a series of four consolidated WIPO arbitrations for the company and successfully enforced the award in three jurisdictions.

Samsung Electronics

Successfully represented the electronics giant in a multi-billion dollar dispute with Microsoft fought out in both the Southern District of New York and in ICC arbitration proceedings.

Suntech Power Holdings

Successfully represented the world’s largest producer of silicon solar power units, in a €500 million cross-border fraud case before the Commercial Court in London, the High Court of Singapore, and venues in several other jurisdictions.

Vivendi Universal

Acted successfully in upholding an LCIA arbitration award valued at €1.7 billion, defeating several challenges to the award in the UK Commercial Court and Court of Appeal.

Representative Clients
Asiana Airlines
Celltrion Healthcare
Dishman Group
Eden Biologics
Leighton Contractors
Samsung Electronics
Sargeant Petroleum
Shinsei Financial