Consider this proposition: wanton torture is morally wrong. Unless you deny that any moral propositions are true, you'll likely sign on to this one. But you probably don't regard it as a conceptual truth. I do. In this talk, based on work I'm doing with John Bengson and Terence Cuneo, I'll defend the claim that there are a range of substantive moral propositions that are conceptual truths. The key element of the case for this view is notion of essence, and an essence-based conception of conceptual truth. Much of the talk will be given over to elucidating the relevant essentialist notions and then, with their aid, defending the view that some substantive moral propositions are conceptual truths.