Kant famously claims that there is only a single supreme principle of morality: the Categorical Imperative. This claim is often treated with skepticism. After all, Kant proceeds to provide no fewer than six formulations of this purportedly single supreme principle—formulations which appear to differ significantly. But appearances can be deceptive. In this paper, I argue that Kant was right. There is only a single Categorical Imperative, and each of its formulations expresses the very same moral principle.