This thesis explores the introduction of the euro as the official currency in the Republic of Croatia from a sociological perspective, highlighting its implications for the national identity of its citizens. The introduction of the euro, as a key step in the economic and political integration of the country into the European Union, not only represents a technical currency exchange but also brings about changes in the perception of sovereignty, cultural identity, and the symbolism of money. The research focuses on how the citizens of Croatia perceive this change and how it reflects on their sense of belonging, sovereignty, and national identity. The euro, as a symbol of European integration, on the one hand, may strengthen the sense of connection with the rest of Europe, while on the other hand, it may evoke feelings of loss of national identity, particularly through the replacement of the kuna, which many respondents view as a symbol of sovereignty and national unity. The theoretical part of the thesis draws on the concepts of identity, symbols, and the history of money in Croatia, analyzing the role of money in the social and cultural context. A quantitative study conducted on a sample of 260 respondents, using the survey method, revealed that citizens recognize the social and cultural significance of money and continue to regard the kuna as an important national symbol of the Republic of Croatia. Although most respondents acknowledge the importance of the euro in the context of European integration, the research also highlighted feelings of dissatisfaction and concern about the loss of national identity. These results emphasize the need for better public awareness of the euro as the official currency. The thesis provides deeper insight into the complex relationship between money, cultural identity, and the perception of sovereignty, opening the door for further research on the social aspects of economic changes within the context of European integration.