It has been a commonplace, embodied in philosophy curricula the world over, to think of Descartes' philosophy as he seems to present it: as a radical break with the past, as inaugurating a new philosophical problematic centred on epistemology and on a radical dualism of mind and body. In several ways, however, recent scholarship has undermined the simplicity of this picture. It has, for example, shown the considerable degree of literary artifice in Descartes' central works, and thereby brought out the deceptive character of his self-presentation there. In particular, it has revealed the extent of his debts to the Neoplatonist tradition, particularly to Augustine, and of his engagement with the Scholastic commentators of his day. My aim in this paper is to push this interpretative tendency a step further, by bringing out Descartes' indebtedness to Plato. I begin by offering some reminders of the broadly Platonic nature of Cartesian dualism. I then argue that he provides clues sufficient for—and designed to encourage—reading the Meditations on First Philosophy in the light of distinctively Platonic doctrines, and in particular, as a rewriting of the Platonic allegory of the cave for modern times. It will further be argued that some puzzles about the Discourse on the Method can be resolved by recognizing that Descartes there presents himself as a Socratic enquirer after truth. I conclude by drawing attention to some practical benefits that flow from recognizing these linkages.