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International Arbitration

Results matter, and ours are unmatched. For example, our International Arbitration team has secured a larger number of positive defense outcomes for sovereign states in investor-state arbitrations than any other firm in the world (see our brochure). We also have a strong track record on behalf of investors, for whom we have secured some of the largest damages awards in ICSID history. In the commercial arbitration space, our team is known for handling sensitive, complex and high-stakes disputes under all major arbitral rules, and is widely acclaimed for its oral argument and cross-examination skills in the hearing room. With highly ranked leading practitioners based in eight offices across the US, UK, China, and South Korea, the team offers clients a practice of exceptional depth and scope.

  • Success Rate: No other firm has an unparalleled track record of positive rulings on behalf of states in investment arbitration. We also have a strong track record on behalf of investors, and in commercial arbitrations.

  • Diversity, Experience and Expertise: Our team members are highly ranked arbitration practitioners and thought leaders, hailing from a broad range of legal, cultural, and linguistic backgrounds. We assist clients from every part of the world.

  • Client Service: With 40+ attorneys across 8 offices in the US, UK, China, and South Korea, and professional fluency in 10 languages, we provide extraordinarily responsive and user-friendly client service and support.

“The ‘exceptional’ Arnold & Porter international arbitration practice is best known for its impressive track record in investor-treaty matters where it has focused on representing sovereign states.”—Legal 500 Latin America
“[Arnold & Porter is] engaged in significant commercial disputes, drawing from a strong group of multilingual practitioners with wide-ranging industry experience.”—Chambers Global
Based on verifiable data from the ICSID website (the world’s leading investment arbitration institution), Arnold & Porter is the world’s leading law firm in ICSID history in number of cases resulting in full dismissal of all claims against the Respondent State.
“[The firm’s] defence wins for states are too numerous to list in full, but they include knocking out a US$700 million ECT claim against Hungary, a US$350 million claim against Costa Rica and claims worth a combined US$140 million against the Dominican Republic.” —Global Arbitration Review “GAR 100”
Language - English

Focus Areas

Key Contacts

Maria Chedid
Maria Chedid
San Francisco
+1 415.471.3279
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  • Chambers Global
    International Arbitration – Global (2024)
    International Arbitration – Latin America (2024)
    International Arbitration: The Elite – USA (2024)
    International Arbitration: Export Controls & Economic Sanctions: The Elite – USA (2024)
    International Arbitration Foreign Expert for Latin America-wide "Spotlight Table" – USA (2023)
    International Arbitration: Investor-State Arbitration – UK (2024)
    International Arbitration: USA Disputes – International & Cross-Border (2023)


  • Chambers USA
    International Arbitration: The Elite – Nationwide (2023)
  • Chambers Latin America
    International Arbitration (International Counsel) (2024)
  • Chambers UK
    International Arbitration: Investor-State Arbitration – UK-wide (2024)
  • The Legal 500 US
    International Arbitration (2023)
  • The Legal 500 UK
    Dispute Resolution: International Arbitration (2023)
  • The Legal 500 Latin America
    International Arbitration (2024)
  • Latin Lawyer 250
    International Arbitration (2022)
  • U.S. News & World Report and Best Lawyers
    "Best Law Firms" International Arbitration: Commercial – National, New York, Washington, D.C., San Francisco (2024)
    "Best Law Firms" International Arbitration: Governmental – National, New York, Washington, D.C. (2024)
  • Global Arbitration Review
    "GAR 100" (2023)
    Listed in Global Arbitration Review's "GAR 30" seven times
  • Latinvex
    Top Law Firms: Arbitration (2021)
  • Euromoney's Expert Guides
    Three of our International Arbitration attorneys ranked for Commercial Arbitration (2019)
  • Law360
  • BTI Consulting Group (BTI)
    Law Firms with the Best Associates (2017)