The object of this research is the social relations that emerge in the context of participation of the prosecutor in consideration of civil cases by the courts of appeal, as well as the problematic aspects of the exercise of his powers in consideration of such cases. The author analyzes the essence of prosecutor's participation in consideration of civil cases by the courts of appeal, and the possibility of attributing such participation to one of the forms of prosecutor’s participation in consideration of civil cases by the courts. The subject of this research is the case law materials, legislative norms that regulate the indicated social relations, as well as the developed positions pertaining to the essence and separate aspects of the prosecutor's participation in consideration of civil cases by the courts of appeal. The prosecutor’s participation in the appellate instance has traditionally been the subject of research among legal scholars; this is associated to the specifics of this institution, that incorporates the elements of consideration of cases by the courts of first instance and their revision, which, in turn, generates discussions on the composition and procedure for the exercise of powers of the prosecutor participating in the appellate instance. At the same time, such research mostly dealt with participation of the prosecutor in consideration of criminal cases by the courts of appeal, while the problematic aspects of prosecutor’s participation in consideration of civil cases by the courts of appeal remained virtually unstudied, which defines the novelty of this work. The author formulates recommendations on the amendments to the current legislation on the forms of prosecutor’s participation in consideration of civil cases by the courts and the procedure for participation in consideration of civil cases by the courts of appeal, the implementation of which would allow the prosecutor’s office to achieve the goal of protection of citizens’ rights and optimization of consideration of civil cases by the courts of appeal.