Moral nihilism is the view that there are no moral facts or moral truths. It is the ontological component of moral error theory, which is the best-known and most comprehensive metaethical theory that involves moral nihilism. My main aim is to discuss some consequences of endorsing moral error theory or believing to some degree that moral error theory is true. In §2, I consider the implications for ordinary moral thought and discourse and the epistemological consequences for moral theorizing. In §3, I consider a recent challenge, according to which moral judgments do not have the epistemic profile that moral error theory alleges. I shall argue in §3–5 that the challenge can be met and that there is evidence that moral error theory is in fact correct about the epistemic profile of moral judgments.