International relations theory has much to gain from studying ethnicity, nationalism, and colonialism. Research on nationalism has produced important theoretical contributions to constructivist approaches in international relations. Similarly, postcolonial theory can contribute to international relations theory by exploring aspects of identity construction that are neglected in studies with exclusive focus on Western states. For example, postcolonial theory can be used in the study of ethnic conflict by combining both aspects of identity construction and strategizing, and how research on ethnicity and nationalism and postcolonial studies can benefit from closer dialogue. Moreover, postcolonial studies raise important epistemological and normative questions that need to be taken seriously by international relations scholars. Postcolonial and subaltern studies question the knowledge claims made by area studies by criticizing their representational strategies of colonialism and the postcolonial situation. They pose a challenge for international relations as a discipline by questioning the knowledge–power nexus. They assert that the presumably “scientific” accounts of the non-West carry the ideological baggage of colonialism. What is needed therefore is to account first for the historical representation of the non-West in Western scientific discourse and produce a critique of this knowledge system as a legitimating and administrative discourse in the service of colonialism.