Objective: The aim is to analyze, in view of baumanian ideas, the fear and public insecurity that affect the Brazilian population in the post-modern era, particularly in recent decades, a phenomenon present in the fluid society, which propagates uncertainty and determines the way of thinking, acting and feelings of individuals. Theoretical Framework: Zygmunt Bauman developed research into the complex web that involves individuals' personal and social ties, in which he produced studies on fear and (in)security, as well as coining the generic expression liquid life, characterized by a precarious routine, with uncertainty, devoid of of a defined and stable model, resembling a liquid. Method: A theoretical, critical and dialectical methodological research, of a bibliographic nature, is carried out, based on a qualitative study, in which a deductive model is used, in light of the contributions of the polish professor. Results and Discussion: It is hoped to provoke a level of discussion that leads to understanding and solutions regarding certain conflicts that exist in the social fabric, such as fear and insecurity that affect citizens. Research Implications: El tema investigado está lleno de interés público, porque involucra y afecta al Estado y a todos los segmentos de la sociedad; por lo tanto, no se pueden ignorar sus causas, efectos y consecuencias. Originality/Value: The approach used in the research is authentic and original, because there is no specific production on fear and Brazilian net public security, categories that impact the lives of citizens, which justifies the study of matters that affect cultural, political and social development from the country.