Kuybyshevsky District is an administrative and municipal district (raion), one of the thirty in Novosibirsk Oblast, Russia. It is located in the center of the oblast. The area of the district is 8,823.3 square kilometers (3,406.7 sq mi). Its administrative center is the town of Kuybyshev. Population: 15,466 ; 19,386 (2002 census); 21,758 (1989 Soviet census).