This chapter presents an overview of Plato’s moral realism. The metaphysical framework of Plato’s moral realism is explained. This framework’s fundamental principle is the superordinate Idea of the Good, which is both the anchor for moral realism and the unhypothetical first principle of all. Thus, for Plato normativity is woven into metaphysics (Section 1.1). A taxonomy of types of moral realism is provided within which Plato’s moral realism can be situated (Section 1.2). Plato’s moral realism is compared to versions of antimoral realism and naturalistic versions of moral realism (Section 1.3). The priority of “good” to “right” in Plato is explained (Section 1.4). The priority of “good” to “value” is further explained. The universality of the Good goes beyond objectivity and is intended to preclude the possibility that “good” and “good for me” can possibly conflict (Section 1.5).