Hrvatska starokatolička Crkva nastala je krajem 1923. godine kao neuspjeli pokušaj reformnoga pokreta dijela nižega katoličkoga klera koji je u razdoblju od 1919. do kraja 1923. težio za reformom i demokratizacijom Katoličke Crkve u Kraljevini Srba, Hrvata i Slovenaca, ali i na poticaj beogradskih vlada, u početku samostalnih demokrata Svetozara Pribićevića, povezanih sa slobodnim zidarima, a kasnije velikosrpske Radikalne stranke, koje su joj davale izravnu i neizravnu podršku u institucionaliziranju i širenju, pokazujući time svoj antagonizam prema katolicizmu. Svi politički subjekti do 1929. godine koji su podržavali reformni pokret i Hrvatsku starokatoličku Crkvu činile su to iz političkoga oportunizma radi slabljenja društvenoga i političkoga utjecaja Katoličke Crkve u hrvatskom narodu, ali i iz vlastitih ideoloških uvjerenja.; The Croatian Old Catholic Church was founded at the end of 1923 as a failed attempt by the reform movement of part of the lower ranked Catholic clergy, which in the period from 1919 to the end of 1923 sought to reform and democratize the Catholic Church in the Kingdom of Serbs, Croats and Slovenes, but also at the encouragement of Belgrade governments, initially the independent democrats of Svetozar Pribićević, associated with the Freemasons, and later the Greater Serbia Radical Party, which gave it direct and indirect support in institutionalization and expansion, thus showing its antagonism to Catholicism. All political entities until 1929 that supported the reform movement and the Croatian Old Catholic Church did so out of political opportunism in order to weaken the social and political influence of the Catholic Church among the Croatian people, but also out of their own ideological beliefs.