The publication offered to the reader is dedicated to the rich and eventful history of the Orthodox Churches of South-East Europe in the period between the two World Wars. These years became turning points in the history of a number of Local Orthodox Churches of the Balkan Peninsula. The Patriarchate of Constantinople lost all its dioceses in Asia Minor, but managed to survive and even increase its influence in the Orthodox world; The Serbian and Romanian Churches acquired the status of Patriarchate and significantly expanded their territories; a new autocephalous Orthodox Church arose - Albanian. At the same time, a number of Local Churches exerted not only spiritual, but also political influence, significantly influencing the situation in their countries (Yugoslavia, Romania, Greece, etc.). In the interwar situation, a significant place was occupied by the relations of the Orthodox Churches of South-Eastern Europe with the Russian Church, to which special attention is paid in the work. In some countries, Russian emigration played a very important role in the development of church life (Yugoslavia, Bulgaria, Czechoslovakia, Hungary). The monograph is based on rich archival sources, in particular, materials from Bulgarian, Serbian, Greek, German, American, Russian and other archives. The book is intended for historians, clergy and anyone interested in the history of Christianity. The publishing layout is saved in PDF A4 format.