The importance of migration as a security issue in a global society is growing. Although illegal migration in this context is in the foreground, it is clear that legal migrations are also security problem, especially for emigration countries. Croatia is undoubtedly one of these countries whose emigration trends have been in the long run since the 19th century. Contemporary emigration trends from the Republic of Croatia since joining the European Union continue to be negative. EU membership facilitated emigration and encouraged many young population to resettle even the entire family. According to the data of the Central Bureau of Statistics, Croats mostly go to Germany, Ireland and Austria, but exact data do not exist. Particularly worrying is the age structure of Croatian emigrants, as it is a young, highly educated, working-active population whose reasons of emigration are primarily related to economic and moral issues. The excessive emigration rate along with other demographic problems, such as the aging of the population, further undermines the demographic picture of Croatia. Since the term security today does not only mean military threats but also a wide range of contemporary threats, the issue of demographic security is a priority for all states. The problem of unfavorable demographic situations is related to the economic development of the country, but also to the development of society in general, because the development of the human factor is the basis of economic development. An adequate legislative framework regulating the issue of migration in Croatia - does not exist, although this is the most affected issue in the Strategic Plan for demographic revitalization for the period 2018-2020. Finally, the paper concludes that the emigration from Croatia has been stimulated by negative economic trends and non-perspecitve environment in general