The main research problem of the thesis is the issue of the place and role of the commands of corps districts in the security system of the Second Polish Republic. Established in 1921, the districts were local administration bodies of the Polish Army. Having different competences in particular years, the district commands constituted one of the essential elements of security of the Second Polish Republic. Despite organizational changes, the command during the entire interwar period responded, inter alia, for matters related to cooperation with civil authorities in the field of broadly understood security. In the first part of the work, the political and military conditions that contributed to the creation of the commands of the corps' districts were indicated, and their general tasks were briefly described. A number of troops and institutions subordinate to them were also indicated. The main part of the analysis covered the construction of the internal structures of DOK and the transformations of these structures, indicating at the same time that many of them were related to a change in the scope of tasks. Each time, attempts were made to indicate the relationship between the activities of individual organizational units and safety, both in direct and indirect terms. At the end of the study, it was emphasized that the DOK, although seemingly dealing mainly with administrative tasks in the army, had a huge impact on the security of the state and the region, which was visible even in the period preceding the outbreak of World War II and after it began. The source basis for this work are the archival materials collected in the Central Military Archives and the literature on the subject.