The relevance of the research lies in the observation that, while Ukraine has established formal democratic institutions since its independence, many democratization issues remain unresolved. These formal structures lack effectiveness and support, with informal, often non-democratic political processes and secret agreements continuing to prevail. The study aims to conclude a theoretical study, conceptualization, and generalization of the problems of the existence of informal institutions, as well as a comprehensive analysis of practical technologies of informal institutionalization in modern Ukraine. The authors used such general scientific methods as analysis and synthesis, induction and deduction, abstraction, the ascent from the abstract to the concrete. The authors considered such informal institutions that exist in the political reality of Ukraine, such as lobbying, corruption, populism, non-conventional forms of political participation of citizens, party agreements, clientelism, and political bargaining. The effective technologies for the informal institutionalization of modern Ukraine, including technologies for eliminating authoritarian practices, technologies of party structuring, technologies of political participation and technologies for the formation of democratic political consciousness have been proposed. These technologies are aimed at the political modernization of Ukraine, ensuring the institutional functioning of democracy at the proper level and minimizing the negative effects of informal institutions.