This book challenges popular international relations theories that claim to be based on the political writings of Immanuel Kant, and sheds new light on the philosopher's perspective on peace. Through an analysis of Kant's philosophical work and political traditions of his time, as well as of neglected concepts and theory, this book reappraises modern perspectives on his work. Kant advocated a cosmopolitan community building perspective of peace and international relations that considered issues that are now significant topics of debate such as state sovereignty and unequal access to resources. This book reveals how Kant's political views translate into a vision of international relations that cannot be associated with the democratic and neoliberal theories of peace which until now have claimed Kant's legacy. While the democratic peace theory continues to inspire policy-making, Kant's predictions on war and peace ultimately prove to be most appropriate for the current issues of globalization and diversity. Offering new insights into the meaning of peace and war in international relations, Kant and International Relations Theory is an invaluable resource for students and scholars of international relations and political theory, as well as for those interested in Kant's scholarship.