This paper deals with the analysis of migration trends in the Republic of Croatia. Demographic trends are very important, because they have a strong influence on the economic development of each country. The Republic of Croatia has been struggling with negative migration trends for a long time, and has gone through three main waves of migration, the last of which was after the Republic of Croatia's entry into the European Union. This paper analyzed internal and external migration and the analysis showed that women migrate mostly within the country, while men leave the country to a much greater extent. The young population migrates the most and the phenomenon of brain drain is significantly pronounced. The paper also presents the results of the conducted research on the intentions and determinants of students leaving the Polytechnic in Šibenik. The results showed that more than half of the students believe that they will definitely or maybe go to work in another country after finishing college, mostly because of better working conditions or additional study. It can be concluded that the socioeconomic status of students does not significantly affect the decision to leave, but the most significant determinant of leaving was the knowledge of one or more foreign languages, which would help these students find their way and work in another country. What is certainly bad is that 23% of students who would go work abroad do not plan to return to the Republic of Croatia after some time.