Borzinsky District () is an administrative and municipal district (raion), one of the thirty-one in Zabaykalsky Krai, Russia. It is located in the south of the krai, and borders with Olovyanninsky District in the north, Aleksandrovo-Zavodsky District in the east, Zabaykalsky District in the south, and with Ononsky District in the west. The area of the district is . Its administrative center is the town of Borzya. Population: 25,095 (2002 Census); The population of Borzya accounts for 60.8% of the district's total population.
The district was established on January 4, 1926.