The aim of this study was to investigate and to present the establishment and operation of the elementary, girls' secondary schools and civil schools and other educational activities of the Sisters 'Adorers of the Blood of Christ' in Bosnia and Herzegovina from the 1880s to 1945. Catholic primary schools in Bosnia and Herzegovina were established in the 19th century during the Ottoman government, and the real momentum of the Catholic elementary education occured with Austro-Hungarian arrival and with expansion of primary schools that were founded by the women religious community. Women religious communities founded also lower secondary schools for girls that during Austro-Hungarian act as girls' secondary schools, and later these schools were transformed into civil schools and thru these schools and other extracurricular activities they contributed to the cultural and educational development in Bosnia and Herzegovina. The Work, besides the literature and other published sources relevant to the history of education and the history of the Sisters 'Adorers of the Blood of Christ', is largely based on unpublished sources from two archives of the 'Adorers of the Blood of Christ': The Zagreb Region Archive, Zagreb and the Archivio Generale Roma in Rome. The work was conceived on the presentation of the operation of the schools that could be divided into the three historical periods and their position in the state educational system they operated in. The methodological work is divided in several sections: introduction and the second section with review broader socio-historical context in which the Adorers came in Bosnia and Herzegovina, as well the history of the emergence of the community itself. The third section presented the foundation and operation of the schools run by the Adorers during period of time from 1880 to 1918, period of time from 1918 to 1941 and the period of time from 1941 to 1945. In each one it was analysed socio-political context, state educational system and foundation and operation of each one of the eleven elementary and five of girls' secondary schools/civil schools. In the fourth section it is made the comparative analysis of curriculum of the schools run by the Adorers and the state ones and quantitive analysis of the students of the elementary school and one of the girls' secondary schools/civil schools run by the Adorers. This written work aims to contribute to better understanding of the position of the Catholic elementary and secondary schools and their contribution to the development of the modern primary and secondary education, the dissemination of culture and education in Bosnia and Herzegovina from 1880 to 1945.