This book moves scholarly debates beyond the old question of whether or not international institutions matter in order to examine how they matter, even in a world of power politics. Power politics and international institutions are often studied as two separate domains, but this is in need of rethinking because today most states strategically use institutions to further their interests. Anders Wivel, T.V. Paul, and the international group of contributing authors update our understanding of how institutions are viewed among the major theoretical paradigms in international relations, and they seek to bridge the divides. Empirical chapters examine specific institutions in practice, including the United Nations, International Atomic Energy Agency, and the European Union. The book also points the way to future research. International Institutions and Power Politics provides insights for both international relations theory and practical matters of foreign affairs, and it will be essential reading for all international relations scholars and advanced students.