Based on the analysis of doctrinal and normative sources, the article outlines the system of principles of the institution of appeal in the administrative procedure, formulates their definition. In particular, a multi-level classification of appeal principles in the administrative procedure is proposed. Depending on the content of legal principles, they can be classified into two large groups - civilizational principles, in particular such as humanism; democracy; freedom; equality; justice, etc. and the principles of the national legal system, which in turn are divided by scope into: general legal: rule of law, legality, legal certainty, limited interference of authorities, officials in the exercise of rights and freedoms; protection of fundamental human rights and freedoms, equality before the law, the inadmissibility of any discrimination in the exercise of rights and freedoms, the inevitability of responsibility for the damage caused, the unity of rights and obligations, the guarantee of rights and freedoms, the independence of courts; prohibition of abuse of rights; etc; interdisciplinary: the rule of law, the principles of transparency and adversariality of parties to court proceedings; equality before the law and the court; inadmissibility of abuse of procedural rights, etc.; the principles of administrative proceedings, in particular those enshrined in the Code of Administrative Proceedings of Ukraine; the principles of administrative procedure established by Art. 4 of the Law of Ukraine "On Administrative Procedure”; institutional principles: rule of law, efficiency, economy and optimality, efficiency, formality, independence and impartiality of the subjects of the review of the complaint, guarantee of effective means of legal protection, etc.
 It is noted that the principles of the appeal institute in the administrative procedure are a system of basic principles, the implementation of which is aimed at achieving the ultimate goal and objectives of the appeal institute, embody its essence and values, and are universally binding guidelines for law-making and law enforcement.