The paper analyzes the data on the victims of the World War One, recorded in the Death register book of the Church of St. Procopius in Prokuplje. The chronological framework of the research refers to 1914 and 1915, from the beginning of the war to the withdrawal of the Serbian army and the occupation of Serbia. The data refers to the territory of the church in Prokuplje (Prokuplje with surrounding villages). The information entered refers to lost members of the Serbian army, Austro-Hungarian prisoners and civilian victims of the war. The number of people listed (which cannot be taken as absolutely accurate due to difficult data collection conditions) amounts to 1,094 persons. Of that number, 221 deceased Serbian soldiers, 148 Austro-Hungarian prisoners and 725 civilians were recorded. According to mortality, three sub-periods can be clearly observed: the first from the beginning of the war to the end of the Battle of Kolubara, the second characterized by increased mortality during the typhus epidemic, and the third until the retreat and occupation. The protocol is part of the Collection of Register Books of the Historical Archives of Toplica in Prokuplje.