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The Kingdom of Ends is a thought experiment in the moral philosophy of Immanuel Kant. It is regularly discussed in relation to Kant's moral objectivist theory and its application to ethics and philosophy in general. Kant introduced the concept in his work, the Groundwork of the Metaphysic of Morals.

The kingdom of ends is a hypothetical state of man derived from the categorical imperative. Rational beings are defined as beings who are capable of moral deliberation; they can choose to act by maxims that have universality. It is from this point of view that they must judge themselves and their actions. This conception of the categorical imperative would lead to another - the kingdom of ends.

By the phrase kingdom, he means the "union of different rational beings in a system by common laws." Since it is through laws that consequences are evaluated based on their universal validity, he states that we can conceive of a systematic whole that includes both the rational beings as ends in themselves and the unique ends which these rational beings may aspire to. This systematic whole is the kingdom of ends.

People can only belong to the kingdom of ends when they give universal laws unto it, and are subject to those same laws, and all laws within. Such rational beings must regard themselves simultaneously as sovereign, when making laws, and as subject, when obeying them. Morality exists in the action of all universal law which can make the kingdom of ends possible. This universal law must be first capable of being universalized completely, and being given its power from a rational being's own will - not exercising rule over it.