With the proliferation of international organizations and their ever increasing role in a wide range of policy fields, situations multiply in which human rights are threatened or violated through the actions, operations, or policies of such organizations. This book is the first to explore these problems in a comprehensive manner and to examine the accountability mechanisms that are available. In the first section, the contributions study general concepts, such as the accountability of international organizations as an evolving legal concept, international organizations as independent actors, the logic of sliding scales in the law of international responsibility, and the relations between the international organizations and their Member States in regard to their respective obligations and responsibilities. Subsequent parts of the book focus on the accountability for human rights violations attributable to international organizations in four areas: peace and humanitarian operations, international civil administration, economic governance, and the staff of international organizations.