The article is devoted to the service of S.N. Terenin as the leader of the nobility of the Kazan province from 1887 to 1897. Previously, the reconstruction of his biography and social activities in Russian historiography was not carried out, and this study is the first attempt to analyze the service of Stepan Nikolaevich Terenin as a provincial leader of the nobility. Based on the office documentation of the noble self-government bodies, the author shows the main directions in Terenin's work. In addition to solving current issues, the activities of the provincial leader of the nobility had a pronounced social orientation. Helping the nobles during their studies in secondary educational institutions, caring for the elderly and sick nobles who were left without the support of relatives, assigning allowances and lump-sum payments – all this has become one of the forms of social protection for representatives of the upper class who find themselves in a difficult financial situation. In addition to short-term measures provided to the nobles and of a situational nature, projects were developed to strengthen the economic well-being of the entire estate. The result was petitions to the government and the satisfaction of some petitions of the Kazan nobility. For citation: Mironova Ye.V. 10 years of leadership: the activity of the Kazan provincial leader of the nobility S.N. Terenin (1846–1897). From History and Culture of Peoples of the Middle Volga Region. 2023, vol.13, no.2, pp.73–82. https://doi.org/10.22378/2410-0765.2023-13-2.73-82 (In Russian)