Nathalie Allen is an experienced international arbitration lawyer specialising in both international commercial arbitration and investor state disputes.  Nathalie represents clients before key arbitral institutions including ICC, LCIA, SCC, ICSID and AAA, and in arbitrations conducted under the UNCITRAL Rules, ICSID and under foreign investment laws.   Nathalie has also acted in many arbitrations governed by a variety of different jurisdictions.  

Nathalie frequently appears before international tribunals on diverse procedural issues, interim measures, jurisdiction, and merits, as well as enforcement, set aside, and annulment proceedings.  She also advises clients on strategies, options, and tactics in anticipation of potential disputes.  Nathalie has particular experience in finance, telecommunications, manufacturing, gambling, insurance, construction and energy.

She has been described as an "extremely impressive" arbitration lawyer who is "very bright and experienced".  Peers comment that she has "always shown a quick understanding of legal issues".  Nathalie has frequently been recognised by Who's Who Legal and Global Arbitration Review as a "Future Leader in International Arbitration".  Nathalie was also recognised as a Rising Star for International Arbitration in Legal 500 and was described as "very smart, diligent and experienced in working on multi-jurisdictional disputes", and has won the Euromoney Women in Law Rising Star for Litigation award.  Nathalie was also included in the Legal 500 International Arbitration Powerlist. 

Nathalie has spoken and published extensively on topics relating to international arbitration, arbitrator challenges, treaty changes, confidentiality, enforcement and climate change.  

Nathalie is qualified in England and Wales, and is a native speaker in French and English, fluent in Spanish and speaks Italian to a high level.  Prior to joining Addleshaw Goddard in 2020, Nathalie worked in the London office of another leading international law firm. 

  • representing a German car manufacturing company in an English law ICC €3 billion arbitration arising over a failed joint venture agreement
  • representing a Canadian manufacturing company in an Italian law ICC €60 million arbitration arising over a breach of contract
  • representing a group of investment funds in a Spanish law ICC €200 million arbitration arising over a shareholders' agreement dispute
  • representing an Asian investment fund in treaty proceedings against a European state
  • representing an individual in €30 million anti-arbitration injunction in the English High Court and the Court of Appeal, as well as in the related arbitration proceedings.
  • How Can Arbitrators Best Protect Their Deliberations from Disclosure: New Challenges and Opportunities in England, Journal of International Arbitration, Volume 36 (2019)
  • Third-Party Funding and Investor-State Arbitration, Legal Guides Investor-State Arbitration 2020
  • Increasingly mandatory disclosure of third-party funding in arbitration, Financier Worldwide Magazine, November 2018
  • Enforcing International Commercial Arbitral Awards, Financier Worldwide Magazine, July 2018
  • Transparency Takes A Step Forward, CDR, December 2017
  • Ethics for International Arbitration: More or Less Regulation?, Current Issues and Future Challenges in International Arbitration, IBA 2015 
  • Arbitrator Disclosure - No Room for the Colour Blind, Asian International Arbitration Journal, 2011 
  • A Recipe for Conflict?, CDR, 5 July 2011
  • Contracts: Strait to the Point, Legal Week, July 2007
  • What price accuracy?, Global Arbitration Review, June 2007
  • French - native speaker
  • Spanish - fluent
  • Italian - high level
Professional Membership
  • International Bar Association
  • Arbitral Women