One of the more complex global problems is migration, with great impact on all countries. Today, migration has become massive and uncontrollable, but looking at the positions of destination and transit countries, they represent a very large, even extremely difficult, problematic issue that actors see in very different ways, resulting in incomplete images of that occurrence. Migrations cause a variety of problems due to which the population goes, and some of them are stagnation, war destruction, climate change, ethnic intolerance, better living conditions and the like. When it comes to modern migrations, it would not be possible to avoid the time spatial dimension, however no matter how the concept of space unit was arbitrary. Purpose of this final work is to see into and explain the term of migration and also migration flows of the Republic of Croatia, especially the ones that took time in 21st century. The big problem of the Republic of Croatia is migration itself. More and more people are leaving the country for better living, wartime, living conditions, and a better future for themselves and their families. Croatia in last couple of years records more negative demographic image due to war destruction's and emigration of people to some wealthier countries. Though there are many reasons for emigration, the ones that stand out the most are: lack of working places and high unemployment rate, long wait for getting a job, problems with finding job in educated field, low salaries for acquired profession, economic crisis, political problems etc.