 Lewis published four books: Convention (1969a), Counterfactuals (1973a), On the Plurality of Worlds (1986a) and Parts of Classes (1991a). His numerous papers have been largely collected in five volumes: Philosophical Papers Vol. I (1983a), Philosophical Papers Vol. II (1986b), Papers in Philosophical Logic (1998a), Papers in Metaphysics and Epistemology (1999a) and Papers in Social Philosophy (2000a). This entry starts with a discussion of Lewis’s first two books, then looks at his contributions to philosophy of mind. Sections 5 and 6 are on his metaphysics, looking in turn at Humean Supervenience and modal realism. Section 7 looks very briefly at some of the many works that aren’t been covered in the previous five categories.