The European Union is a key participant in international organisations with its involvement taking different forms, ranging from full membership to mere observer. Moreover, there is also not only one status of observer, but different ones depending on the constituent charters of the organisations. This book provides a comprehensive overview of the participation of the EU in five international organisations: the UN, the ILO, the WTO, the WHO and the WIPO. It identifies its role and influence in diverse areas of global governance, such as foreign policy, peace, human rights, social rights, trade, health and intellectual property. EU and international experts, diplomats and scholars have contributed to this book to give an overview of the different aspects linked to the participation of the EU in these organisations and to the coordination that takes place internally with its Member States. They also examine the EU's actual influence in the various areas and its contribution to global governance. The combination of these two dimensions allows the work to identify the strengths and weaknesses of the participation of the EU in these five international organisations. The book provides valuable insights for scholars, policymakers and is useful for representatives of other international organisations and civil society actors.