The aim of the article is to describe Klaus Mann's political and social views, especially two of them – his critique of nationalism and his activity as the spokesman for anti‐fascism. Mann's anti‐nationalist attitude is connected with his cosmopolitism inspired not only by count Coudenhove‐Kalergi but by the vision of pan‐Europe and pacifism as well. The political standpoint of Mann is influenced strongly by his early political experience. The roots of his leftist way of thinking can be also seen in connection with the influence on him of André Gide. Generally the French impacts on his thought are considerable and reflect in his emphasizing individual freedom as well as in the idea of French‐German alliance because France and Germany constitute "almost Europe."