The Lutherjahrbuch 2013 serves as report of the 12. International Congress for the Research on Luther, that took place in Helsinki on 5.-11.8. 2012. It contains the manifold presentations and seminar reports in German and in English language. Furthermore the yearbook provides reviews of the important new publications on Luther and Reformation. Also part of the Lutherjahrbuch is the Luther-bibliography, that lists continuously new releases on Luther and his impact until today. Therefore this yearbook is a most powerful tool for the entire research on Luther.