This unique book investigates the implications of the rising importance of supra-national regional organizations for global governance in general, and for the United Nations, in particular. It touches upon issues such as regional representation at the UN, high-level dialogues with regional organisations, as well as the coordination of UN member states' voting behaviour in the UN General Assembly and the UN Security Council. The book further explores the regional dimension and coordination of UN operations in areas such as peace and security, human rights, and sustainable development. The contributions to the book are both in-depth chapters and shorter viewpoints, written by a combination of academics, policy-makers at regional organizations, and experts from international think tanks. The book is essential reading for anyone interested in the future of global governance.