This thesis explores the impact of the euro's introduction on price trends and the cost of living in the Republic of Croatia. The euro's adoption in Croatia is associated with changes in monetary policy and the adaptation of Croatia's national economy to the conditions of the Economic and Monetary Union. The thesis is structured into several key sections, covering the theoretical foundations of the European Economic and Monetary Union, the mechanism of euro adoption in Croatia, and an analysis of price trends and citizens' perceptions of the cost of living following the euro's introduction. The focus is placed on the changes that occurred in the period following the euro's adoption, with particular emphasis on inflation trends, citizens' purchasing power, and changes in the prices of basic goods and services. The thesis concludes that there has been an increase in the prices of certain products and services; however, the analysis shows that inflation was mainly the result of broader economic factors. The transition to the euro had a limited impact on overall living costs, with most price changes being anticipated and consistent with the experiences of other countries that have adopted the euro. In the long term, the introduction of the euro is expected to contribute to greater financial stability, a reduction in transaction costs, and an acceleration of economic growth in Croatia.