The catalog of earthquakes (К R ≥6.6) which occurred in the Baikal rift zone (BRZ) was declastered, and the results are presented in the article. Aftershocks of seismic events (К R ≥12.5) were determined by the software developed by V.B. Smirnov (Lomonosov Moscow State University) with application of the algorithm coauthored by G.M. Molchan and O.E. Dmitrieva. To ensure proper control of the software application, aftershocks were also selected manually. The results of declustering show that aftershocks of the earthquakes (К R ≥12.5) account for about 25 per cent of all seismic events in the regional catalog. Aftershocks accompanied 90 per cent of all the earthquakes considered as main shocks. Besides, earthquake swarms, including events with К R ≥11, were identified. The results of this study show that, in the BRZ, the swarms and strong events with aftershocks are not spatially separated, and this conclusion differs from the views of the previous studies that reviewed data from a shorter observation period. Moreover, it is noted that the swarms may consist of several main shocks accompanied by aftershocks. The data accumulated over the last fifty years of instrumental observations support the conclu sion made earlier that the swarms in BRZ occur mainly in the northeastward direction from Lake Baikal and also confirm the trend of a small number of aftershocks accompanying earthquakes in the southwestern part of the Baikal rift zone.