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 . Its administrative center is the rural locality (a selo) of Bolshoye Selo. Population: 9,906 (2010 Census); The population of Bolshoye Selo accounts for 35.6% of the district's total population.