Mary Flanagan is a senior associate in the Litigation/Controversy Department, and is a member of the International Arbitration Practice Group. 

Ms. Flanagan has represented clients in arbitrations under a variety of institutional rules (including ICC, UNCITRAL and CAS rules) involving both common law and civil law disputes in Europe and Asia. She has particular experience in energy, joint venture, real estate, construction, financial services and sports disputes. 

Prior to joining WilmerHale, Ms. Flanagan represented clients in major human rights litigation and led international humanitarian law and human rights investigations in the Asia Pacific. She worked as an associate at another leading international law firm and as a lawyer in the Department of Foreign Affairs and Trade, Ireland.


  • Representing a major mining company in a US$ 1 billion ICC arbitration seated in London concerning the performance of a supply and purchase agreement.


  • Investigating Perpetrators: A guide to mapping parties in relation to international humanitarian law and human rights violations’, Public Interest Advocacy Centre and UC Berkeley School of Law Human Rights Center, April 2023. 
  • ‘Prosecution of war crimes in Australia: prospects for victim participation’, Asia Pacific Journal of International Humanitarian Law, October 2021.
  • ‘In Poor Health: Health care in Australian immigration detention’, Public Interest Advocacy Centre, June 2018. 
  • ‘Interim Measures: an effective strategy or a toothless tiger?’, The ACICA Review, June 2016.
  • ‘Overview of recent statistics on international arbitration in Asia-Pacific’, Australian Alternative Dispute Resolution Law Bulletin, December 2014.
  • ‘Torture and Counter-Terrorism’ in Research Handbook on International Law and Terrorism, B. Saul, ed., Edward Elgar (pp. 379-400, 2014).


  • Education

    • Graduate Diploma of Legal Practice, Australian National University, 2014

    • Bachelor of Civil Law, University of Oxford, 2012

      AHRC Scholar, Prendergast Scholar 
    • Barrister-at-law degree, Honourable Society of the Kings Inns, Ireland, 2010

    • Bachelor of Civil Law (European), University College Dublin, Ireland, 2009

      Gold medalist for first in class
    • Diplome d’Etudes Juridique Francais, Université Paris Nanterre, France, 2008

  • Admissions

    • Ireland, Solicitor

    • High Court of Australia

    • Supreme Court of New South Wales

  • Languages

    • English

    • French



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