This study deals with the phenomenon of European integration and its impact on national party programs in Poland, a current member state of the European Union. The author will argue that the question of European integration has left a mark on the political party programs of two mainstream domestic parties on opposite sides of the ideological dimension, in the form of a certain degree of convergence regarding the “European issue”. Relating the result of the analysis to the theoretical structure of Europeanization and sociological institutional change, the essay will attempt to show a possible link between them. Although this trend does not seem to indicate any dramatic effects of the membership per se in the programs (the national arena seems, in most cases, be of more value for party activities) there is an indirect effect in the form of the presence of Europarties and a pronounced incentive for social and economic adaptation.