Ethics has increasingly been studied as a specific field within the academic subject of International Relations (IR). While the idea that ethics is distinct from politics (whether domestic or international) it certainly would have been foreign to those writing on topics such as war, peace, rights and trade up until the twentieth century. The 1990s and 2000s have seen a substantial growth of attention to the ways in which IR conceives and analyses themes of an ethical nature, and how issues, problems and policies involving ethics are addressed by a variety of actors within the international system. Consequently, although recent attention to such matters has a long historical pedigree, the burgeoning recognition of ethics and international relations as a distinct and substantive field is a significant development in its own right. This volume provides a comprehensive and up-to-date resource for an international readership consisting of scholars, policymakers, students, and members of the general public with an interst in the ethical dimensions of international affairs. This volume includes an Introduction followed by 27 chapters grouped into the following five parts: Part I deals with traditions of international ethics and major normative and political perspectives on the role, evolution, and significance of ethics within international affairs; Part II explores ethical thinking in regard to the key problems of war, conflict, violence, and peace within the international system; Part III is focused on the central role of human theory and practice within the contemporary international system, and on current debates about the nature, scope, and justification of human rights; Part IV addresses a variety of normative arguments, judgments, and assessments focused on questions of justice and specific issue areas within international affairs; and, Part V examines how the dynamics and processes of globalization raise new challenges to thinking about ethics beyond the traditional state-oriented international system. This indispensable collection widens the perspective from 'ethics and international relations' to 'ethics in international relations' redressing the (mis)perception that ethical concepts, principles, norms and rules are in part constitutive of the international system and the agents acting within that system. Necessarily cross-disciplinary, expertise is drawn beyond IR narrowly conceived to include philosophy, political theory, religious studies, history and law making this an ideal volume for any library reference collection.