Kalach-na-Donu (Russian: Кала́ч-на-Дону́), or Kalach-on-the-Don, is a town and the administrative center of Kalachyovsky District in Volgograd Oblast, Russia, located on the Don River, 72 kilometers (45 mi) west of Volgograd, the administrative center of the oblast.

[4] At the same time, its name was changed to Kalach-na-Donu, to distinguish it from an eponymous town in Voronezh Oblast.

In the 1990s, the population of Kalach-on-Don grew slightly due to thousands of Russian repatriates from the republics of the former USSR.

Since March 25, 2010, the town has the honorary title City of Military Glory (Decree of Russian President Dmitry Medvedev No.

On July 9, 2024, six Ukrainian kamikaze drones attacked an oil storage facility near the town shipyard.