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Max Planck Encyclopedia of Public International Law [MPEPIL]

International Courts and Tribunals, Amicus Curiae

Philippe J Sands, Ruth Mackenzie

From: Oxford Public International Law (http://opil.ouplaw.com). (c) Oxford University Press, 2023. All Rights Reserved.date: 30 November 2023

Amicus curiae — International organizations, practice and procedure

Published under the auspices of the Max Planck Institute for Comparative Public Law and International Law under the direction of Professor Anne Peters (2021–) and Professor Rüdiger Wolfrum (2004–2020). 

1 An amicus curiae, or friend of the court, has been defined as ‘[a] person who is not a party to a lawsuit but who petitions the court or is requested by the court to file a brief in the action because that person has a strong interest in the subject matter’ (BA Garner [ed] Black’s Law Dictionary [8th ed Thomason West USA 2004] 93). In international proceedings in a case before the International Centre for Settlement of Investment Disputes (ICSID) in 2006, it has been described as ‘an offer of assistance—an offer that the decision maker is free to accept or...
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