Bolsheselsky District (Russian: Большесе́льский райо́н) is an administrative[1] and municipal[6] 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).

[2] Its administrative center is the rural locality (a selo) of Bolshoye Selo.

[9] The population of Bolshoye Selo accounts for 35.6% of the district's total population.