The subject of this research is the impact of climate change on tourism offer and tourism demand both worldwide and in Croatia. Tourist destinations and the tourism industry are sensitive to climate change. Climate affects the length but also the quality of the tourist season and the selection of a tourist destination as well as tourist expenditure. The vulnerability of tourism that responds faster to climate change than other sectors will particularly be revealed in the developing countries whose development is based on natural resources including this phenomenon. Among them it is also the Republic of Croatia that is endangered to a great deal. Therefore, it is of the utmost importance that people who work in tourism, especially those working at local and regional level, accept measures of adaptation to climate changes and base their further development on sustainable development.