The purpose and aim of the research described in this graduate thesis is focused primarily on the analysis of seasonal characteristics of tourism in the European Union based on the analysis of tourism trends in all 28 EU Member States. The emphasis will be put on the analysis of the seasonal characteristics of tourism activities in the Republic of Croatia. Due to the marked characteristics of seasonality which are traditionally associated with tourism trends on the European ground, the aim of the thesis is to analyse the measures for tackling seasonality that are undertaken in the European Community. Therefore, the analysis of seasonality in the EU will be conducted for each Member State, with particular reference to the position of Croatia with regard to the other countries. Given that in the future the distribution of tourist movements on the European ground should be affected by global climate changes, these forecasts are also reviewed. The final part of the thesis defines the measures taken in the EU in order to tackle the seasonality of tourist traffic and therefore states the example of the Calypso programme and other activities undertaken in the Union for this purpose. A separate chapter is devoted to the analysis of tackling the seasonal tourist traffic in Croatia.