The Second World War is one of the most destructive, brutal and bloody wars in the history of mankind. The Soviet people "paid" a high price for the liberation of their territories and the territories of the countries of Europe and Asia from the fascist regime. The war claimed the lives of 11444,1 thousand Soviet servicemen and 13684,7 thousand civilians of the Soviet Union, leaving eternal memory and glory to the heroism, feats and perseverance of Soviet citizens. Statistics cannot convey the full depth of the tragedy for our people, but they can objectively assess the scale of human, economic, material, socio-cultural problems. The article is devoted to the topic of assessing the human losses of the RSFSR during the Great Patriotic War and the contribution of the Soviet people to the establishment of inter-country peace. To achieve this goal, an analysis of the losses of the civilian and military population of the RSFSR in wartime was performed, in particular, the dynamics of the population by gender and age was analyzed, a comparative assessment of the actual population with the hypothetical one was given, the irretrievable losses of Soviet servicemen and civilians, including children, were analyzed, the infant mortality of the population was studied, and the ratio of the number of men and women at the beginning and end of the war was considered. The Great Patriotic War "threw" the country back decades in terms of demography, social and economic development. For example, with regard to human losses, it took 10 years for the population to reach the pre-war level again. In the scientific article, the official data of the Federal State Statistics Service were used, for data analysis, the methods of constructing generalizing indicators, dynamics series, comparative analysis, as well as tabular and graphical representation of the results obtained were used.