The legal principle of ne bis in idem proclaims that no person shall be tried twice for the same matter. This principle is important in theory and practice, as it safeguards a fundamental individual interest and spares the accused the burden of a repeat trial. This book provides a comprehensive examination of the ne bis in idem principle in international criminal law. Readers will find a detailed account of ne bis in idem rules in the law and practice of the International Criminal Court and other international criminal courts. The book also examines international law ne bis in idem rules that govern the domestic prosecution of international crimes. The book will be a valuable resource for researchers, academics and policy-makers working in the areas of International Criminal Law and International Human Rights law. It will be of particular use to those interested in defense rights, admissibility of cases before international criminal courts, and issues arising from prosecution of international crimes in multiple criminal jurisdictions.