The purpose of the article is the determination of the role of legal conclusions of the SC in providing the principle of legality. For implementation of this purpose the following tasks were performed: 1) justification of the thoughts that the legal conclusions of the SC in the modern conditions are characterized by the numerous number of signs of court precedent; 2) proving the constantly increasing role of legal conclusions of the SC in providing of the implementation of the principle of legality; 3) determination of the expanded content of the principle of legality based on the obligation of the subjects of authority to take into account the legal conclusions of the SC in their activity. During the study of the topic of the article, the author analyzed the works of scientists who pay attention to the study of the role and significance of legal conclusions of the Supreme Court in the activities of subjects of power as N. Zozulia, O. Kibenko, M. Sambor, M. Shumylo and others. Some questions connected with the determination of the role of legal conclusions of the Supreme Court in ensuring the unity of judicial practice, were investigated by the author of this article when compiling the "Compendium of Legal Positions of the Supreme Court for lawyers" and developing the content part of the analytical and legal system ZakonOnline (Kibenko, 2022). Nevertheless, in modern legal science there is still a list of unsolved issues in the sphere of the role definition of legal conclusions of the Supreme Court in providing of the principle of legality. Based on the conducted research, it is concluded that it is established by the law the obligation for all courts and subjects of authorities to consider (apply) legal conclusions of the SC allows to confirm that such approach causes the expanded application of the principle of legality, as the norm of law in fact cannot exist separately from the SC case law (its legal understanding) and the subject of authorities cannot have own approach to understand of this or that norm of law.