This paper proposes a new account of the relationship between Kant’s ethics and Kant’s philosophy of right. I reject the claim of some philosophers that Kant’s Groundwork of the Metaphysics of Morals cannot offer a foundation for Kant’s philosophy of right. While I agree that the basic principles of Kant’s philosophy of right cannot be deduced from Kant’s ethical Categorical Imperatives, I try to show that we find in Kant’s Groundwork the normative resources for grounding his philosophy of right. My (...) thesis is that Kant’s conception of a realm of ends, as he develops it in the Groundwork, provides a common normative source for Kant’s ethical Categorical Imperatives, on the one hand, and the Universal Principle of Right, on the other. Agreement on common universal principles, which is crucial for Kant’s notion of a realm of ends provides, I will argue, a justification of the ethical Categorical Imperatives and the Universal Principle of Right. (shrink)