Khaybullinsky District is an administrative and municipal district (raion), one of the fifty-four in the Republic of Bashkortostan, Russia. It is located in the south of the republic and borders with Zilairsky and Baymaksky Districts in the north, Orenburg Oblast in the east and south, and with Zianchurinsky District in the west. The area of the district is 3,912 square kilometers (1,510 sq mi). Its administrative center is the rural locality of Akyar. As of the 2010 Census, the total population of the district was 33,398, with the population of Akyar accounting for 20.8% of that number.