Based on the quoted literature, the article presents an overview of the administration systems in the Slovene Littoral Region (the area between the Rapallo border and the 1915 border between Austria-Hungary and Italy, without the Kanalska Valley). In the period between 1918 and 1954. when the present borderline between Italy and former Yugoslavia (present-day Slovenia) was established, the Slovene Littoral Region had very different organisations of administration. In the region, the Italian administration, the administration of the German occupying forces, the administration of the Slovene Liberation Movement, and the military administrations of Yugoslavia and the Western allies were all active. The article deals with all these different administrative- (both territorial and administrational) - legal organisations.