Abstract: The research subject includes the features and peculiarities of institutionalization of political authority in the Pridnestrovien Moldavian Republic (PMR) in the context of historical and modern political processes. The author substantiates the objective prerequisites to institutionalization of political authority in Pridnestrovie, outlines the key factors of its formation and functioning. The author proves the thesis about the role of international legal recognition of PMR for institutionalization of political authority in the Republic. The article demonstrates the delegitimizing factors of the political regime which influence the condition of its institutionalization. The study is based on the institutionalist approach and comparative analysis. Coupled with other political theories, they help study new polities as an integral independent institution with its own requirements and development trends. The author concludes about a complicated hybrid form of institutionalization of the political regime in the Pridnestrovien Moldavian Republic, institutionalization of public authority as a system historical and political problem, the interdependence of institutionalization and legitimation of power and their internal and external factors. The research materials can be used in political practice and as an additional source of information in political science and regional studies.