The basic function of declaring legal remedies is to correct an incorrect or unlawful decision of a state or other public authority. The right to appeal is a personal right of citizens, which is guaranteed by the Constitution of the Republic of Croatia. An appeal is a regular, universal and devolutive remedy available to a party who is dissatisfied with the decision brought in the administrative proceedings by a public body. The party contests the legality and / or regularity of the first-instance decision before a second-instance public body, which thereby protects the legal interests of the parties involved in the proceedings by controlling the legality of deciding on the challenged decisions of the lower bodies. Furthermore, the right to review court decisions of first instance administrative courts before the High Administrative Court of the Republic of Croatia is also ensured in administrative dispute, in accordance with the powers in the appeal process regulated by the 2012 Administrative Disputes Act. Therefore, the aim of this paper is to show what types of (court) decisions can be appealed; what the appeal deadlines are; what the powers of the first instance and second instance bodies on appeal are, i.e. the powers of first instance administrative court and the High Administrative Court of the Republic of Croatia as an appeal court in administrative dispute; how to waive an appeal; manners of filing an appeal.