In Humanity's Law, Ruti Teitel offers an account of one of the central transformations of the post-Cold War era: the profound normative shift in the international legal order from prioritizing state security to protecting human security. As she demonstrates, courts, tribunals, and other international bodies now rely on a humanity-based framework to assess the rights and wrongs of conflict; to determine whether and how to intervene; and to impose accountability and responsibility. Cumulatively, the norms represent a new law of humanity that spans the law of war, international human rights, and international criminal justice. Teitel explains how this framework is reshaping the discourse of international politics with a new approach to the management of violent conflict. She maintains that this framework is most evidently at work in the jurisprudence of the tribunals-international, regional, and domestic-that are charged with deciding disputes that often span issues of internal and international conflict and security. The book demonstrates how the humanity law framework connects the mandates and rulings of diverse tribunals and institutions, addressing the fragmentation of global legal order.