Graduate thesis on this topic will explore the emergence of migration and how it affects regional economic development. Migration is the spatial mobility of the population. This graduate paper will explore which decisions and possibilities of migration are to growth or decline in economic growth, as well as development. Nowadays, economy has a great need to monitor regional economic growth and development in relation to migration due to the impact that migration has on the labor market. It will show what migration has impact on the development of the region of the Republic of Croatia (its advantages and disadvantages). Beside all causes of migration, for example economic, social and other forms, it will be shown what kind of outcome the economic development of a given region is. The impact of migration on regional development should be considered by considering for its dual function. The mobile part of the human population leads to the mechanical change of its geographical position within the abandonment of the region of origin. Based on that, the demographic scope of the immigration region is depleted, thereby impoverishing the region of origin, to the extent that it enriches the immigration region. The mobile part of the human population leads to the mechanical change of its geographical position within the abandonment of the region of origin. Based on that, the demographic scope of the immigration region is depleted, thereby impoverishing the region of origin to the extent that it enriches the immigration region. Each form of migration greatly influences the regional outcome and the migration destination. If we look at the region as a separate territorial unit where there are no specific migration barriers, depending on the migration properties, we can talk about an emigration, immigration or neutral region. In the first case, there is a stronger mechanical outflow from the region than the simultaneous mechanical intake in that region.