The article is devoted to the analysis of modern challenges for the theory of the state and law in the context of the development of the legal system of Ukraine. Starting with the introduction, the author emphasises the relevance of the topic and emphasises the need to consider these issues in the Ukrainian context. The theoretical part of the article deals with a historical overview of the state and law, in particular, their development in Ukraine. The author draws attention to the key aspects of the formation of the theoretical foundations that formed the basis of the country’s modern legal system. Modern trends in the development of the legal system of Ukraine are also considered. The author analyzes various aspects such as corruption, human rights and the implementation of reforms. The problems and challenges faced by the Ukrainian legal system are highlighted, and possible ways to overcome them are outlined. A separate part is devoted to the influence of globalisation on changes in the concepts of the state and law. The author considers the phenomenon of globalisation as a factor affecting the modern legal system of Ukraine and highlights its consequences and opportunities for further development. In addition, the article examines the role of the Constitution of Ukraine in the formation of the legal system. The author analyzes the basic principles of the state and law enshrined in the Constitution and their significance for the functioning of the country’s legal system. Attention is drawn to international experience in solving challenges for the theory of the state and law. The author conducts a comparative analysis of different countries, which allows to highlight the best practices and use them to improve the legal system of Ukraine. A separate aspect is the role of civil society in the formation of the legal system. The author emphasises the importance of active participation of citizens in the legal process and their influence on the development of the legal system. In the conclusion, the author sums up the research and highlights the main conclusions regarding modern challenges for the theory of the state and law in Ukraine. It is noted that the further development of the country’s legal system requires complex measures and systemic reforms, as well as the active implementation of best practices and experience of other countries.