The article analyses the socio-historical background of the European Reformation ideas development and dissemination, which influenced the institutional design of the Evangelical-Protestant communities in Ukrainian lands in the late 16th – early 17th centuries. Social and religious determinants of the Reformation-Protestant theological thought development, as well as the reaction of the Orthodox Church to the Protestant religious and theological system formation are analysed. The authors had outlined the consequences of the Reformation movement for the Ukrainian society
