In recent decades, disasters have become increasingly common. Resulting from profoundly unequal structural processes, disasters have been treated, hegemonically, as isolated events, unrelated to the social system in which they are inserted. This doctoral thesis had as main objective to know the place occupied by social assistants in the management of disasters in Brazil. The study was based on a bibliographical review of critical theory, especially in relation to the categories of disasters and risks, considered fundamental for the understanding of the thematic, and was based on the research based on the triangulation of method, from which the quantitative and Are understood as complementary. The quantitative phase of the survey involved 142 municipal protection and civil defense agencies throughout the country, while the second qualitative phase was composed of a case study based on interviews conducted in five municipalities affected by the impact of 2011 on Interior of the state of Rio de Janeiro. The results of the research demonstrated a significant absence of social workers in the municipal protection and civil defense agencies, as well as the predominance of an action directed to the implementation of punctual and fragmented actions, usually developed after the call of crowded professionals in the organs responsible for Social assistance policy in municipalities. It is understood that both the absence of social workers and the type of action performed are not detached from the prevailing logic in disaster management, in which the focus on the actions developed after the impacts occur prevails, reinforcing the Subalternized character of the Social Service with the multiprofessional teams, although efforts are made in the opposite direction. Based on these conclusions, the study in question turns to the defense of a greater participation of social workers in civil protection and defense structures, the need to invest in studies on the field of disasters, and points to initiatives that seek Greater alignment between actions developed by social workers in disaster management and the ethical-political project that has been built by segments of the category since the last two decades of the twentieth century.