An innovative, interdisciplinary and far-reaching examination of the actual reality of international courts, International Court Authority challenges fundamental preconceptions about when, why, and how international courts become important and authoritative actors in national, regional, and international politics. A stellar group of scholars investigate the challenges that international courts face in transforming the formal legal authority conferred by states into an actual authority in fact that is respected by potential litigants, national actors, legal communities, and publics. The book provides a novel framework for conceptualizing international court authority that focuses on the reactions and practices of these key audiences. Eighteen scholars from the disciplines of law, political science and sociology apply this framework to study thirteen international courts operating in Africa, Latin America, and Europe, as well as on a global level. Together the contributors document and explore important and interesting variations in whether the audiences that interact with international courts around the world embrace or reject the rulings of these judicial institutions.