I defend a novel account of the wrong of subjecting people to non-consensual sterilization (NCS), particularly in the context of the state-sponsored eugenics programmes once prevalent in the United States. What makes the eugenic practice of NCS distinctively wrong, I claim, is its dehumanizing core: the fact that it is tantamount to treating people as nonhuman animals, thereby expressing the degrading social meaning that they have the value of animals. The practice of NCS is prima facie seriously wrong partly, but (...) crucially, on these grounds. I consider and reject accounts of the wrong of NCS that make no reference to its animalizing character, such as that it violates victims’ (procreative) autonomy, amounts to treating them merely as a means, inflicts psychological harm on them, or constitutes an affront to their human dignity. My discussion suggests that the critical vocabulary of bioethics should be expanded beyond talk of rights-violations, benefits and harms, and equal treatment—and that the language of dehumanization is indispensable to bioethicists. (shrink)