What are Physical Properties

This paper concerns an issue in the metaphysics of properties. The issue is: what are physical properties? What distinguishes physical properties from all other properties? My conclusions will be ‘downbeat’. I will argue that some major recent approaches to this issue prove unsatisfactory, and that the issue is much more intractable than has widely been supposed. The moral I draw is that there is no principled and well-defined distinction between physical properties and all other properties, and accordingly certain programmes in metaphysics should be abandoned because they mistakenly assume that there is such a distinction.