Croatia's accession to the European Union in 2013 raised issues such as what this means for Croatia's sovereignty and independence when it comes to political, economic and similar economic decisions, and whether there is a danger to the survival of national identity. The European Union encourages the creation of European citizenship and actively works to spread and promote its values to nation states. This process of Europeanization, which is spreading to all spheres of nation states, is quite noticeable. What will be discussed in this paper is precisely about one of the symbols of the European Union, and that is the euro. By adopting the euro as the official currency, nation-states expand and strengthen European identity. In addition to this social aspect, they also facilitate the exchange of goods and services on the market using the same, i.e. common currency. The question arises as to what the introduction of the euro meant for the Republic of Croatia, given that the Croatia kuna is a symbol of the state and has an important meaning because it is also the first currency of Croatia as an independent state. Moreover, does the introduction of the euro mean the loss of one of the fundamental symbols of the state and national identity? In addition to the sociological aspect, the economic aspect is also important, the changes in the market that the euro brings, and whether prices have increased, how wages are moving and ultimately what effect the introduction of the euro has on monetary policy and the entire economy. Also, what ultimately worries citizens the most is whether they will live better or worse after the adoption of the euro. Finally, an online survey was analyzed on the topic of researching citizens' attitudes towards the introduction of the euro in the Republic of Croatia.