The topic of this final thesis is the Regional Development of Croatia. Regional development fosters and enhances both social and economic progress. At the beginning of the thesis, we explain what regional policy is, its components, and how it functions in Croatia and within the European Union. Cohesion policy aims to reduce social and economic disparities among regions of member countries. To measure the competitiveness of different regions in Croatia, we use the Development Index, the Regional Competitiveness Index, and the Economic Strength Index. Using these three indicators, we compared two Croatian counties, Bjelovar-Bilogora County and Istria County. Based on the analyzed data, we conclude that Istria County is more competitive than Bjelovar-Bilogora County. Based on the data we have analyzed, we conclude that Istria County is more competitive than Bjelovar-Bilogora County. This conclusion is drawn based on the Development Index of the counties, as BjelovarBilogora County falls into the category of less-developed areas, while Istria County is categorized as a more developed region. Across all three indices, there are noticeable differences among the counties, with Bjelovar-Bilogora County being significantly less developed than Istria County.