jats:titleAbstract</jats:title>jats:pLocke's commentators are divided about whether Locke thinks that the idea of a person is a substance idea or a mode idea. I use Locke's theory of kinds to argue for an intermediate interpretation on which the idea of a person is a substance idea that contains a mode idea. As a result, while proponents of the substance interpretation correctly claim that ‘person’ designates a kind of substance, proponents of the mode interpretation are nonetheless correct in insisting that mode ideas play an important role in Locke's account of persons and personal identity.</jats:p>