In the academic and professional literature, there is a lack of research on what kind of lobbying strategies or interest representation are used by Croatian interest groups in their efforts to influence the processes of creating European policies. Therefore, this paper tried to contribute to the scarce body of literature in that area. Although lobbying is often associated with a bad reputation, it is part of the decision-making process in the European Union, and all decisions made at the European level also concern Croatia. Therefore, it is important to know and understand which techniques and tools Croatian interest groups use when creating European policies. Action strategies of Croatian interest groups were determined by analyzing data from the Transparency Register on a sample of 72 interest groups. During the data analysis, statistical methods and graphical and tabular presentation of data were used. The paper also used inductive and deductive methods, analysis methods, synthesis methods and comparison methods, and it can be concluded that Croatian interest groups do not have clearly defined goals or lobbying strategies, nor do they provide enough information to the public about their activities. Therefore, recommendations and suggestions are given to improve the activities of Croatian interest groups in the European Union. Also, there are suggestions for improving the Transparency Register and adopting a legislative framework that will regulate lobbying in Croatia.