Is Spinoza's Ethics Metaethically Constructivist?

Charles Jarrett and P. D. Zuk have argued on independent grounds that Spinoza's Ethics delineates a moral antirealist/constructivist position. I reconstruct their basic arguments, present their textual evidence, and suggest that the evidence is, in principle, compatible with moral realism. As I argue, Jarrett and Zuk have opted for an antirealist/constructivist interpretation of the adduced textual evidence because they tacitly rely on a mistaken metaethical assumption: that relational normativity entails moral antirealism/constructivism. I explain why this is not the case by reference to Aristotle's virtue ethics, as well as by reference to various contemporary metaethical positions that conjoin relational normativity and moral realism. I conclude that the textual evidence Jarrett and Zuk rely on does not suffice to render Spinoza's Ethics unequivocally morally antirealist/constructivist and that the morally realist interpretation remains defensible.