The fourth edition of this market-leading textbook offers students a clear framework for understanding the practice and logic of International Organizations Law.

It is structured around the three defining relationships IOs engage in – namely, with their member states, with their organs and staff, and with the outside world. These different dynamics give rise to different concerns, which each help to explain the logic behind international institutional law.

The text also discusses the essential topics of the law of IOs, including powers and finances, privileges and immunities, institutional structures, and accountability. By demonstrating how the theory works in practice, with recent examples, students will observe the impact and significance of International Organizations Law.

Updated with the latest case law and literature, this new edition also contains discussions of the withdrawal of Israel and the US from UNESCO, Brexit, and the Covid-19 pandemic, and how these affect the law of international organizations.

• Engages students by demonstrating how theories relate to real applications, including recent considerations like the withdrawal of Israel and the US from UNESCO, Brexit and the Covid-19 pandemic
• Structured in an understandable framework that aims to show how different aspects of the law are connected
• Treats international organizations as part of a larger landscape, not just as creatures of law, placing the work of international organizations in their social, political, and economic context