Nikolayevsky District is an administrative and municipal district (raion), one of the seventeen in Khabarovsk Krai, Russia. It is located in the east of the krai. The area of the district is . Its administrative center is the town of Nikolayevsk-on-Amur (which is not administratively a part of the district). Population:

Within the framework of administrative divisions, Nikolayevsky District is one of the seventeen in the krai. The town of Nikolayevsk-on-Amur serves as its administrative center, despite being incorporated separately as a town of krai significance—an administrative unit with the status equal to that of the districts.