With the precipitate and well-deserved demise of positivism as the only theory of knowledge backstopping international relations, a large number of ethical issues, emasculated by positivism's non-cognitivist views of morality, are emerging for philosophical reflection and analysis. One of the most important of these is relativism. Despite its obvious (and increasing) significance, however, few international theorists have specifically addressed the issues it raises. One of the main reasons for this neglect, this article argues, lies in the conspicuous failure on the part of the newer normative approaches to international relations even to acknowledge that a relativist interpretation is a plausible construal of their position. In the next section, three examples of such failure will be described. It is no accident that these examples derive from anti-realist positions. A perspicuous feature of anti-realism has been its evident incapacity to give sufficient weight to the fact that the world is divided into antagonistic groups which have serious, perhaps even irreconcilable, moral and political conflicts with one another. But whatever may be the case for anti-realists, revisionary political realism is in no position to obscure its relation to relativism. The possibility of relativism, for the revisionary political realist, arises from simple reflection on the realist tradition.