Bolsheselsky District is an administrative and municipal district (raion), one of the seventeen in Yaroslavl Oblast, Russia. It is located in the center of the oblast. The area of the district is 1,353 square kilometers (522 sq mi). Its administrative center is the rural locality of Bolshoye Selo. Population: 9,906 ; 10,703 (2002 census); 13,053 (1989 Soviet census). The population of Bolshoye Selo accounts for 35.6% of the district's total population.