Mazanovsky District (Russian: Маза́новский райо́н) is an administrative[1] and municipal[5] district (raion), one of the twenty in Amur Oblast, Russia.

The area of the district is 28,316 square kilometers (10,933 sq mi).

[3] Its administrative center is the rural locality (a selo) of Novokiyevsky Uval.

[8] The population of Novokiyevsky Uval accounts for 29.2% of the district's total population.

[4] River Selemdzha and its tributaries Ulma and Orlovka flow across the district.