The relevance of the research is determined by the novelty of the topic, taking into account the Law of Ukraine "On Administrative Procedure". The purpose of the study is to characterize the category "guaranteeing effective legal remedies" in the national administrative legal doctrine, taking into account the European standards for the protection of the rights, freedoms and interests of the individual, and to determine the directions of research into the problems of challenging administrative acts in public administration. The research uses many methods, including general scientific and special legal ones: comparative legal, systemic structural, analysis, synthesis, and others, which makes it possible to systematically and consistently approach the solution of scientific problems, to investigate different positions of scientists, the provisions of legal acts and formulate appropriate conclusions. An analysis of the essence of the principle of guaranteeing effective legal remedies was carried out. Two components of the principle are distinguished: 1) the right of a person to appeal the decision, actions or inaction of an administrative body; 2) the duty of an administrative body to inform a person about the method, procedure and terms of filing a complaint against an administrative act that negatively affects his rights, freedom or legitimate interest. This opens the way for in-depth scientific understanding of this topic. In the process of analysis, a number of problematic moments related to the incorrect use of the provisions of this principle were revealed. It is emphasized that the implementation of the principle will affect: a) a change in the format of interaction between individuals and administrative bodies in the direction of raising the standards of such communication; b) reducing the burden on administrative courts, etc.On the basis of the conducted research, conclusions were formulated and recommendations were made, namely, that the principle of guaranteeing effective means of legal protection: 1) is based on EU standards, taking into account national specificities; 2) is an additional mechanism for the protection of persons; 3) is implemented mainly at the level of the institute of administrative appeal, which has certain advantages compared to judicial appeal. Therefore, in the context of the transformation of national legislation, there is a need to conduct additional research on the specifics of the implementation of this principle, taking into account the realities of today.