This chapter provides an overview of Kant’s conception of the animality (or Tierheit) of human beings. Though human animality is treated in a wide range of Kant’s writings, it has received relatively little attention from scholars, perhaps because Kant wrote no text principally devoted to the subject. With the aim of establishing its systematic unity, I track the status and role of animality across three distinct but interrelated domains of Kant’s theory of human nature—his account of animality as one of three basically good original human predispositions in Religion Within the Boundaries of Mere Reason, his account of animality as the target of discipline in the pedagogy lectures, and his account of animality as simultaneously a driver of and hindrance to the progress of history in ‘Idea for a Universal History With a Cosmopolitan Aim’. I argue that these accounts, taken together and in light of the teleological vision of human development that connects them, manifest a distinctively Kantian vision of the human as an actively rational, but at the same time ineliminably animal, being. Far from denying that humans are animals or seeking to repress human animality wholesale, Kant in fact offers a nuanced and robust, though still problematic, defence of the necessity, innocence, and originality of the human’s animal side.