The article analyzes the essence of the institution of citizenship, the main principles of this institution, clarification of the constitutional bases, their types, scope and importance in the system of legal status of the citizenship of the Republic of Uzbekistan on the basis of comparative analysis of the sources of constitutional law and legislation of foreign countries, and exploration of the study of international law and universally recognized standards. It identifies legal gaps and contradictions in the field of legal regulation of citizenship of the Republic of Uzbekistan on the basis of comparison of the legislation of the CIS and the Baltic states, and provides scientifically based proposals and recommendations for their elimination. Moreover, the need and benefits of the implementation into national legislation, including the Constitution of the Republic of Uzbekistan based on the results of the research of the level of compliance of the legislation on citizenship of the Republic of Uzbekistan with the universally recognized rules and principles of international law. In addition to, the article emphasizes the significance of the application of universally recognized legal norms in internal law, which improves the “image” of the Republic of Uzbekistan in the international arena and show clear position on the right to citizenship (or change it).