This volume seeks to explore the complex relationship between the European Union and International Organizations, and to fill a remarkably wide gap in existing literature on the topic. Analysing the way in which the EU engages in some of the most important international organizations, this book outlines a framework for analysis within this thriving subject of study. By demonstrating how the EU supports 'effective multilateralism' and global governance, as well as furthering developments within foreign policy, this volume adopts a novel perspective on the EU as an international player. Seeking to move the focus of study beyond the European Union as itself an international organization, contributors set out to demonstrate EU aspirations to act within international organizations. The volume's key features include: the first comprehensive study on this topic eight case studies of the EU, including its role within the UN, WTO, NATO, and the ICC contributions from both internationally renowned political scientists and economists The European Union and International Organizations will be of vital interest to students and scholars of international relations, European Politics, Political Science, and International Organisations. It will also be of interest to a wider readership including policy makers, diplomats, and journalists.