The article is devoted to a detailed study of administrative procedure as one of the key branches of law and its correlation with international legal systems, such as the legal systems of the European Union (EU) and the United States of America (USA). The study of these systems is important for understanding current trends in the development of administrative law in Ukraine, especially in the context of its integration into the European legal area and large-scale legal reforms. The purpose of this study is to identify commonalities and significant differences between the administrative processes in the EU and the US, and to assess how these processes can be integrated into the Ukrainian legal system. Particular attention is paid to the analysis of administrative justice principles such as the rule of law, fairness, access to justice and judicial independence. The study shows that, despite significant differences between the legal traditions of the US and the EU, both systems share a common goal of ensuring transparency and accountability of administrative bodies and protecting the rights of citizens. The article analyses the different approaches to administrative justice, in particular, it shows that in the EU and the US, they are united by such important elements as independence of the judiciary, access to justice and protection of human rights. These principles may serve as guidelines for the development of administrative law in Ukraine, where reforms are aimed at strengthening the judicial system and improving the mechanisms for protecting the rights of citizens in their relations with administrative authorities. Particular attention is paid to the analysis of the impact of the EU and US legal systems on the development of administrative law in Ukraine. Ukraine, on its way to integration into the European Union, has already adopted many elements of the European legal system, in particular in the field of administrative justice. At the same time, the American experience of regulating economic relations through administrative law may also be useful for Ukraine in the context of developing a market economy and building a state governed by the rule of law. Thus, the article concludes that the integration of Ukrainian administrative law into the European legal space should take into account both the EU’s positive experience in the field of human rights protection and transparency of public administration, and American approaches to regulating economic relations and ensuring the effectiveness of administrative justice.