International organisations, non-State actors, and the formation of customary international law

By: Sufyan Droubi (Editor), Jean d'Aspremont (Editor)

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Paperback | 20 January 2026

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456 Pages

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23.4 x 15.6 x 2.34

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This volume offers new practical and theoretical perspectives on one of the most complex questions regarding the formation of international law, namely that actors other than states contribute to the making of customary international law.

Notwithstanding the International Law Commission's valuable contribution, the making of customary international law remains riddled with acute practical and theoretical controversies that continue to be intensively debated. Making extensive reference to the case-law of international law courts and tribunals, as well as the most recent scholarly work on customary international law, this volume provides a comprehensive study of the contribution of international organisations and non-state actors to the formation of customary international law. With innovative tools and guidance for law students, legal scholars, and researchers in law, as well as legal practitioners, advisers, judges, arbitrators, and counsels, this collection is essential reading for those wishing to understand and address contemporary questions of international law-making.

Industry Reviews

'Where the ILC stopped in its 2018 Conclusions on Identification of Customary International Law, this book continues. It offers a rich variety of theoretical and practice-inspired reflections, doing justice to the ways in which international organizations and non-state actors contribute to the development of customary international law.'
-Niels Blokker, Professor emeritus of International Institutional Law (Schermers Chair), Leiden University

'Overall, the book is a great source for anyone interested in the general theoretical issues of customary international law, as well as those who have an interest in narrower questions on the role that international organisations and non-state actors have at different stages of the making of customary international law.'
-Journal of International Law of Peace and Armed Conflict

'The book is a great source for anyone interested in the general theoretical issues of customary international law, as well as those who have an interest in narrower questions on the role that international organisations and non-state actors have at different stages of the making of customary international law. Outside of theory, the volume offers the reader an opportunity to look at the theoretical issues from a practical perspective.'
-Humanit¤res V¶lkerrecht

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