Bagansky District (Russian: Бага́нский райо́н) is an administrative and municipal district (raion), one of the thirty in Novosibirsk Oblast, Russia. It is located in the southwest of the oblast. The area of the district is 3,367.73 square kilometers (1,300.29 sq mi). Its administrative center is the rural locality (a selo) of Bagan. The population of Bagan accounts for 33.1% of the district's total population.