In recent years there has been a major visibility of the national claims on Europe and, in consequence, there is an increase of comparisons between different movements. The research consists in seeing the possible existence of similitudes and differences between Catalan nationalism and Croatian and Serbian nationalisms based on the analysis of different factors such as the concept of nationalism, the history, the political organization, the elections or the international reaction. The tendency of Spanish media to deal with the Catalan question in relation to the Ex-Yugoslavian question is also analysed