The article presents an analysis in the transformation of models for state-confessional relations in the Belarusian provinces of the Russian Empire (early 20th century – 1917), in the BSSR (1919–1991), in the Republic of Belarus (1991–2002). The author noted that during the twentieth century there was a transition from the model of the religious state of the period of the Russian Empire to the model of the secular state in the form of hostile separation in the BSSR and the cooperative model in the Republic of Belarus. The process of forming state-confessional relations and their transformation was highly dependent on the socio-political and state situation of the Belarusian lands. That conditioned the determining importance of external factors (political crisis, revolutions of 1905 and 1917, transformation of political systems of the Russian Empire and the USSR) for the paradigm shift of state-confessional relations in Belarus at the beginning of the twentieth century – 1991. At the same time, the formation of a model of state-confessional relations in the Republic of Belarus was predominantly influenced by internal factors – the dominance of traditional religious actors, a high degree of religiosity of the population and the intensification of religious activities, what contributed to the consolidation of the cooperative model, the most valid for the politicalconfessional sphere of Belarusian society.