The relationship between a powerful United States of America and some of the central multilateral organizations in global society is an essential feature of contemporary international relations. ‘US Hegemony and International Organizations’ brings together a range of leading scholars to examine this crucial phenomenon. Its aims are two-fold: to describe and explain US behaviour in and towards a wide range of significant global and regional institutions; and secondlyto examine the impact of US behavior on the capacity of each organization to meet its own objectives. The study explores US behavior and its consequences for organizations based at the regional as well as the global levels, for those located in different regions of the world, and for such issue areasas security, economics, and the environment. Although focusing on the period since the 1990s, each chapter places its findings in a broader historical context.