The current practice of disability studies largely groups itself according to various “models” of disability, such as the “medical,” “social,” “identity,” and “minority.” While insightful, each is incomplete: some focus on the medical component of disability, others on its social implications, and yet others on its personal significance. The present chapter proposes an account of disability grounded in Thomistic anthropology. In this system, an individual is a human being insofar as he or she possesses a particular kind of essence or nature. Given this nature, a person has certain natural abilities that, if certain other requisite conditions are met, allow the person to perform typical operations. Disability – and the closely related term “impairment” – concerns inabilities to perform given activities and various consequent inequities that may arise. The “Thomistic model” proposed aims to incorporate insights from prevailing models of disability and, thus, to enrich contemporary disability studies through the application of Thomistic philosophy.