The term population migration refers to the mobility of residents in space, ie spatial mobility. Nevertheless, it is not easy to define the term migration, since all attempts to define it come up with several definitions and typologies of migration with respect to the respected criteria during the definition. In the modern times, the phenomenon of migration is of increasing importance and has multiple effects on all aspects of today, including modern tourism. The situation is the same in the territory of the Republic of Croatia, where immigration and immigration trends are increasingly developing. Population and tourism development are directly interconnected and this paper will analyze the impact of migration on tourism development. As stated throughout the paper, all migration implies two areas, the area of origin and the area of settlement, so that the interconnectedness of migration and development can be observed in the area of immigration and the area of immigration. In the long run, with large financial allocations and investment in human resources, integrating migrants into the domestic economy can have a positive impact on economic effects. This is especially true for countries with labor shortages, and the integration of migrants can also help address the general problem of an aging society.