The aim of this paper is to characterize three main concepts of region developed in the period of the 2nd Republic. First of all, the Author describes the ethnographic concept of region, created by Kazimierz Moszyński. He focuses on tangible differentiators of region. Józef Obrębski, who is Moszyński’s disciple, takes as a basis the ethnographic concept of region and adds to it the idea that a region is formed in contact between members of a regional group with the Other. Józef Chałasiński, the author of the third concept, shares Obrębski’s view and adds that it is in contact with the Other that is developed the most important factor in the region-building process, namely regional identity. The paper offers information on the theoretical tradition of sociology of region in today’s Poland.