We argue that the way in which the concept of expertise is understood and invoked has prevented progress in the debate as to whether moral philosophers can be said to be ‘moral experts’. We offer an account of expertise that draws on the role of tacit knowledge in order to provide a basis upon which the debate can progress. Our analysis consists of three parts. In the first part we highlight two specific problems in the way that the concept of expertise has been invoked in the moral expertise debate, namely the understanding of expertise as an exclusive concept and the conflation of expertise with the idea of ‘authority’. In the second part we suggest an alternative way of approaching the concept of expertise. This is based on Collins and E...