The 12th International Kant Congress in Vienna is dedicated to the antagonism of nature and freedom, which is as much an issue of great relevance in contemporary discussions as it was during the Enlightenment period. The question of to what extent human actions are guided by nature or free will seems even less clear in modern times than it was in the 18th century. Kant’s writings offer significant potential for contemporary interdisciplinary discussions, which connect philosophy with natural sciences, medicine, neurology and psychology, law and social sciences. While the Kant Congress 2015 will mainly focus on these issues, there will be also three key topics related to Vienna: Kant and the Vienna Circle, Kant and phenomenology and Kant and the poets. Furthermore, there will be various additional sections in order to account for the wide range of topics in Kant’s philosophy. The official languages of the congress are German, English and French.