ENThe purpose of this article is to conduct a comparative analysis of the functioning of the legislative power in the Republics of Lithuania, Latvia, and Estonia. This analysis focuses particularly on the fundamental differences and similarities in the functioning of the parliaments of these Baltic republics. The research methods used, especially the comparative method and institutional-legal analysis, allowed for the implementation of the indicated research objective. The analysis was conducted on the basis of the following basic laws: the Constitution of the Republic of Lithuania of October 25, 1992; the Constitution of the Republic of Latvia of February 15, 1922; and the Constitution of the Republic of Estonia of June 28, 1992. Identifying the differences and similarities in the implementation of the basic functions of legislative institutions in the light of Lithuanian, Latvian and Estonian basic laws is a topic worthy of scholarly investigation. Keywords: parliament, competences, Baltic republics, the Constitution of the Republic of Lithuania of 25 October 1992, the Constitution of the Republic of Latvia of 15 February 1922, the Constitution of the Republic of Estonia of 28 June 1992.