Maslyaninsky District is an administrative and municipal district (raion), one of the thirty in Novosibirsk Oblast, Russia. It is located in the east of the oblast. The area of the district is 3,453 square kilometers (1,333 sq mi). Its administrative center is the urban locality of Maslyanino. Population: 24,438 ; 27,196 (2002 Census); 26,421 (1989 Soviet census). The population of Maslyanino accounts for 53.6% of the district's total population.