Kalachinsk (Russian: Кала́чинск) is a town in Omsk Oblast, Russia, located on the Om River along the busiest segment of the Trans-Siberian Railway, 100 kilometers (62 mi) east of Omsk, the administrative center of the oblast.

[1] As an administrative division, it is incorporated separately as the town of oblast significance of Kalachinsk—an administrative unit with the status equal to that of the districts.

[1] As a municipal division, the town of oblast significance of Kalachinsk is incorporated within Kalachinsky Municipal District as Kalachinsk Urban Settlement.

[3] In the Soviet days of restricted commerce, the town acquired local fame for its weekend market.

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