This monograph provides a systematic analysis of the constitutional and legal foundations governing the activities of political parties in the Republic of Uzbekistan, with particular emphasis on their role and significance in the functioning of representative bodies of state authority. It specifically examines the legal status of political parties and their interaction with the Legislative Chamber of the Oliy Majlis and local representative bodies (councils). The monograph analyzes the participation of party factions in the legislative process and in the exercise of parliamentary oversight, as well as the organizational and legal frameworks regulating their activities. It identifies existing gaps in the legislation based on legal practice and formulates scientifically grounded proposals and recommendations to address them. This research serves as a valuable academic and practical resource for students of institutions of higher legal education, researchers, legal scholars, members of parliament, political party representatives, practicing lawyers, and all those with an interest in this field. The author wishes to express his sincere gratitude to Umid Sobirov, Lecturer in the Department of Constitutional Law at Tashkent State University of Law (TSUL), for translating this monograph into English. It is our hope that this work will be useful to all-law students, academics, and legal practitioners.