Kalach-na-Donu, also known as Kalach-on-the-Don, is a town located in the Volgograd Oblast of Russia. It serves as the administrative center of the Kalachyovsky District and is situated along the Don River.
The town is positioned approximately 72 kilometers (45 miles) west of Volgograd, which is the administrative center of the oblast. According to the 2021 census, the population of Kalach-na-Donu is 17,624.