This article examines the phenomenon of solitary living as a consequence of the processes of individualization that are characteristic of the entire modern world. The urgency of this problem arises from the increase in the number of individuals who prefer to live alone. Although this trend is typical for Eastern Europe, as it is for the rest of the world, it is not widely considered in scientific circles. Whilst analyzing scientific literature in different spheres (philosophy, economics, psychology, sociology) and statistical data on solitary living, the author has come to the conclusion that to describe the phenomenon in a sociological vein, it is most appropriate to consider solitary living as a “solo-living” lifestyle. The article also examines the main studies of solitary living in Eastern Europe, and through such work, it was concluded that there is not enough research: current research mainly considers single living among the older generation, despite the fact that the number of young people who prefer this lifestyle continues to grow. In the course of the study, the author was faced with the problem of layering related concepts: solos, singles, solo-living, single-person households, and others. To avoid this problem, the author distinguishes between these concepts and makes an attempt to conceptualize the concept of “solo-living”, offers the author’s definition, and outlines further research prospects.