Duldurginsky District () is an administrative and municipal 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 . Its administrative center is the rural locality (a selo) of Duldurga. Population: 15,316 (2002 Census); The population of Duldurga accounts for 43.3% of the district's total population.
The Khentei-Daur Highlands rise at the southwestern end of the district.
The district was established on January 16, 1941.