This final paper analyzes the demographic trends and changes that are happening in the Republic of Croatia and their impact on the economy. At the beginning of the analysis the theoretical demographic framework and an overview of the demographic situation in the Republic of Croatia from the beginning of the 20th century to the present day are set and used to discover current demographic trends. The analysis of demographic trends concluded that the demographic situation is unfavorable and that the basic factors of such a demographic situation are population aging, natural depopulation, and negative migration. Population aging, depopulation and migration are manifested as unfavorable factors of the demographic situation in the overall analysis of the population structure of the Republic of Croatia. The analysis leads to the conclusion that the oldest population is the most numerous, the birth rate and fertility are low, and frequent migrations are current, which, together with the previous two factors, lead to natural depopulation of the population. Demographic trends have a negative impact on the entire economy of the Republic of Croatia, which is reflected in trends in the labor market, with many unemployed compared to many retirees, which causes problems in the pension system and pensions are very low. Low pensions affect the overall consumption and savings of the population. Many retirees are below the poverty line and therefore savings in the Republic of Croatia are low, and consumption is only for the most necessary goods, that is food, beverage and renting and housing costs.