 In a naturalistic constitutive explanation of the property (or properties) of being normative, the explanans (for each normativity property) would be a natural property, or perhaps a naturalistic “condition”, all the constituents of which are natural properties. For example, if to be an acid is to be a proton donor, then it is a necessary truth that every acid satisfies the condition, or has the complex property, of being a proton donor. Our question, then, is whether there could be a similar explanation of normativity. Could there be an explanation of the normativity of normative facts according to which, for such a fact to be normative is for it to satisfy a condition X, Y, Z where each constituent of this condition is something natural?