In contemporary democracies lobbying is considered as legitimate interest representation and attempt to influence the decisions of public authorities. The accession of Croatia to the European Union has opened up a completely new environment for lobbying for a large number of interested stakeholders from civil society and the business sector, requiring proactive action in a multi-level, dynamic process of creating European public policies. Due to its indispensable role in the legislative process at the EU level, the European Parliament has been continuously exposed to high interest and pressure of lobbyists from almost all spheres of socio-economic life of the Member States of the EU and beyond. Due to insufficient representation of this topic in the academic literature in Croatia, the aim of the research was to gain insight into the most commonly used methods of lobbying influence in the European Parliament and the perception of the effectiveness of these methods from the perspective of Croatian MEPs in the European Parliament. The research conducted for the purpose of this thesis has shown that lobbyists are actively involved in the daily life of the European parliament. The effectiveness of lobbying methods depends on many factors, but primarily on the sectors of activity of interest groups and the personal skills of lobbyists. Croatian lobbyists compared to other European lobbyists are generally considered to be less proactive. From the response of interviewed MEPS it can be concluded that the contribution of lobbyists is significant in terms of providing timely information on the situation on the ground and the possible impact of new legislation on individual sectors, which contributes to improving the quality of European policies.