 Leibniz’s place in the history of the philosophy of mind is best secured by his pre-established harmony. In a more popular view, this is the thesis that, roughly, there is no mind-body interaction strictly speaking, for there is only a non-causal relationship of harmony, parallelism, or correspondence between mind and body. Certainly, the pre-established harmony is important for a proper understanding of Leibniz’s philosophy of mind. But there is much more to be considered, and even when it comes to the pre-established harmony, this more popular view needs to be refined, particularly insofar as it suggests that Leibniz accepts a roughly Cartesian, albeit non-interactionist dualism. He does not accept such a dualism, and in fact, Leibniz is justly famous for his critiques not only of materialism but also of any dualism of this sort. In short, he made important contributions to a number of classical topics in the philosophy of mind, including materialism, dualism, and mind-body interaction.