Nikolayevsky District () 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 . Its administrative center is the town of Nikolayevsk. Population: 34,285 (2002 Census); The population of Nikolayevsk accounts for 47.1% of the district's total population.