Nikolayevsky District (Russian: Никола́евский райо́н) is an administrative district (raion), one of the thirty-three in Volgograd Oblast, Russia. As a municipal division, it is incorporated as Nikolayevsky Municipal District. It is located in the northeast of the oblast. The area of the district is 3,440 square kilometers (1,330 sq mi). Its administrative center is the town of Nikolayevsk. Population: 32,034 (2010 Census); 34,285 (2002 Census); 35,145 (1989 Census). The population of Nikolayevsk accounts for 47.1% of the district's total population.