When the court in the civil proceeding lacks proficiency in certain matters, the court shall appoint experts as a special proofing tool for assessment of facts and drawing a conclusion. The role of an court expert is drafting an objective, independent and professional expert opinion based on carried out examinations that will help the court in clarification of the facts in matter so that a fair decision can be made. Considering the necessity and importance of expertise in legal proceedings, experts have certain personal and procedural duties that should guarantee expert's independence, impartiallity and integrity. This paper deals with court experts in civil proceedings, spesifically, it deals with expert's duties in the proceedings, as well as with disobeying those duties that secure objective and fair legal decision making. Considering the fact that the Republic of Croatia is a member state of the EU, this paper will also present documents at the EU level that serve as a frame of reference for all the parties involved in the proceedings considering the role of a court expert, as well as the analysis of the non-existing common european standards regarding court experts.