In this chapter, we show that moral uncertainty creates a challenge for another metaethical view, namely non-cognitivism, according to which moral judgements are desires, or some other desire-like states, rather than beliefs. We show that it is surprisingly difficult, though perhaps not impossible, for non-cognitivists to accommodate moral uncertainty, for they lack the resources to adequately distinguish degrees of moral confidence and degrees of value ascribed to things. We discuss Lenman’s and Ridge’s versions of ecumenical expressivism and argue that neither are able to satisfactorilty explain moral uncertainty. We consider Sepielli’s defense, based on the ‘being for’ account of normative certitude, but argue that it, too, suffers from grave problems.