Foreign trade is an economic activity that includes the exchange of goods and services with foreign countries. The intensity and volume of foreign trade varies among countries, but it is almost impossible to plan the development of one country or progress without the presence of trade with other countries. The form of foreign trade depends on subjective and objective circumstances, and there is a difference between indirect and direct appearance on the foreign market. The Republic of Croatia is an economically small country, so it is also a small market, but in terms of resources it is a medium-rich country. The foreign trade of the Republic of Croatia is largely determined by its membership in the WTO and the EU. By joining the EU, the Republic of Croatia undertook to implement the Common Trade Policy. The final paper analyzes the foreign trade of the Republic of Croatia before and after EU accession. The analysis of foreign trade includes analysis by counties, analysis of trends in imports and exports, trade with economic groups, trade with selected countries and analysis of trade by activity. The contribution of accession to the European Union is visible in the increase in the coverage of imports by exports from an average of 58% before accession to an average of 62% of coverage in the years after accession. Also, the structure of foreign trade remained somewhat the same with an increase in the value of trade. The impact of EU accession on the course of foreign trade in agri-food products is then observed in detail. A brief analysis and comparison of the foreign trade profile between the Republic of Croatia and other EU members, Slovenia and Slovakia is also provided. Slovenia and Slovakia both had a negative trade balance before joining the European Union, such as the Republic of Croatia, while after accession they needed 11 and 7 years, respectively, to achieve a positive trade balance and improve their foreign trade.