Статья посвящена анализу выборов в законодательные собрания российских регионов в 2019–2020 гг. и воздействию результатов этих выборов на состояние региональных партийных систем. На основе количественного анализа показаны нарастание конку-ренции в партийных системах регионов и неравномерный характер этих изменений. The elections to the legislative assemblies of the Russian regions, held in 2019–2020, did not become a turning point in the development of the Russian political system. However, the results of these elections demonstrate a well-defined vector in the dynamics of regional party systems. The data of the study strongly indicate that in the regions of Russia there is a gradual increase in the level of political pluralism. Despite changes in electoral legislation and the efforts of the regional authorities, the effectiveness of participation in the elections of the parliamentary opposition and non-parliamentary parties is growing. Although the number of parties that put forward lists in regional elections is decreasing, and election commissions register not all party lists, the share of votes that go to the opposition is increasing. Reducing the activity of some parties and not allowing others to participate in the election campaign no longer guarantees the victory of the “party of power’. In the context of the growing protest activity, the reduction in the number of election participants is one of the factors in the consolidation of the opposition increasing its effectiveness. Therefore, the factional composition of the legislative assemblies of the regions, which are less and less similar to the four-party State Duma, is expanding. So far, the effect of the “fabricated majority” still allows United Russia to maintain leadership in almost all regional parliaments. However, the increase in the effective number of electoral and parliamentary parties in practice in all regions over the past years convincingly confirms the tendency to increase the level of inter-party competition. The index of the average effective number of parties developed by the author allows comparing between regions and relatively accurately determining the place of each of them in the overall rating. Although most of the regions where legislative elections were held in 2019–2020 are difficult to classify as competitive, the value of the index of the effective number of parties has increased even in them. Moreover, a number of regions, following the results of these elections, showed a noticeable increase and a high level of the value of this index by Russian standards. All this suggests that the diversity of regional party systems in Russia is growing, and this trend requires the attention of researchers.