 What is left of Xenocrates’ views is here divided up under three headings: Metaphysics, Theory of Knowledge, and Ethics. Sextus Empiricus tells us (Adversus mathematicos vii 16; fr. 1H, 82IP: here and in the sequel ‘H’ refers to the collection of fragments in Heinze 1892 and ‘IP’ to that in Isnardi Parente 1982) that Xenocrates was explicit about the division of philosophical topics implicit in Plato, into ‘physics’, ‘ethics’, and ‘logic’; this became the norm in Stoicism and Hellenistic philosophy in general. We have a great deal more to work with under the first heading than under the other two. As is standard with this terminology, what we are accustomed to refer to as metaphysics and theory of knowledge are included in ‘physics’ and ‘logic’, respectively.