Аннотация:The formation of social solidarity ties is one of the key problems on the agenda of the governments of the modern states. The world practice shows that it is impossible to solve it once and for all. In many ways, this is why the solidarity has been the object of interest of sociologists for many decades. The ideas of social solidarity, mostly having their foundations in the works of the classics of sociology A. Comte, H. Spencer, F. Giddings, E. Durkheim, T. Parsons, and others, are widely known. The contribution of the Russian pre-revolutionary sociologists and philosophers to the development of the ideas of social solidarity turned out to be on the periphery of science. Pitirim Sorokin, who considered solidarity in three hypostases – as a form of organization of society, as a manifestation of altruism in interpersonal and intergroup relations and as a sign of constructive social behavior, is the only Russian sociologist regularly mentioned in a number of authoritative authors who proposed an alternative understanding of the principles and origins of the formation of solidarity ties. His ideas about them resonate with the ideas of the other Russian thinkers (P. Kropotkin, P. Lavrov, M. Bakunin, N. Mikhaylovsky, N. Kareev), who defined social solidarity as a manifestation of social initiative and ‘the engine of social progress’, a resource for social mobilization and a factor of achieving social justice and resisting pressure of state.The purpose of the article is to reveal the main provisions of the concept of social solidarity of Sorokin as the quintessence of the ideas of solidarity ties developed in the Russian pre-revolutionary sociology. The concept of Sorokin and the ideas of the Russian sociologists and philosophers that definitely influenced on its development laid the foundation for the further analysis of social solidarity and its formation as a phenomenon and process coming ‘from below’, depending on the behavior and will of each member of society. These ideas turned out to be consonant with the tendencies in the modern Russian society which is making the real efforts to strengthen the social ties in the circumstances of the deficit of state policy in this sphere.