Duldurginsky District (Russian: Дульдургинский райо́н) is an administrative[1] and municipal[4] district (raion) of Agin-Buryat Okrug of Zabaykalsky Krai, Russia, one of the thirty-one in the krai.

It is located in the south of the krai, and borders with Chitinsky District in the north, Aginsky District in the east, Akshinsky District in the south, and with Ulyotovsky District in the west.

The area of the district is 7,200 square kilometers (2,800 sq mi).

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

[3] The Khentei-Daur Highlands rise at the southwestern end of the district.