Kalachyovsky District (Russian: Калачёвский райо́н) is an administrative district (raion), one of the thirty-three in Volgograd Oblast, Russia. As a municipal division, it is incorporated as Kalachyovsky Municipal District. It is located in the south of the oblast. The area of the district is 4,200 square kilometers (1,600 sq mi). Its administrative center is the town of Kalach-na-Donu. As of the 2010 Census, the total population of the district was 58,524, with the population of Kalach-na-Donu accounting for 46.0% of that number.