Which competences do professional adult educators require? The article discusses this topic in a comparative perspective, finding that adult educators' required competences are wide-ranging, heterogeneous, and complex. However, it seems that certain competence requirements can be identified which transcend national, cultural and functional boundaries. The article summarises these requirements in four themes: communicating subject knowledge, taking students' prior learning into account, supporting a learning environment, and reflecting on one's own performance. The ability to train students to use what they have learned in practice (knowledge transfer) seems to be overlooked in the different competence profiles analysed.