On the basis of data from the all-Russian censuses of 1989-2010, as well as the results of specific sociological studies, the analysis of the dynamics of language proficiency by various ethnic groups in the national republics of Siberia is performed. The analysis of the data revealed a tendency to integrate ethnic communities into the all-Russian linguistic and cultural space based on the strengthening of the role of the Russian language as a factor of consolidation and harmonization of interethnic relations. Despite the differences in the patterns of language policy in the republics of Altai, Khakassia, Tyva, Sakha (Yakutia), as well as different proportions in the ethnic composition of the Russian and of the titular ethnic groupsthe studyrevealed a common trend of increasing the share of population choosing the Russian language as native.