The chestnut-breasted partridge (Arborophila mandellii) is a partridge species endemic to the eastern Himalayas north of the Brahmaputra, and occurs in Bhutan, Darjeeling, Sikkim, Arunachal Pradesh and south-eastern Tibet at elevations from 350 to 2,500 m (1,150 to 8,200 ft).

[1] The scientific name commemorates the Italian naturalist Louis Mandelli.

[2] It is a distinctive partridge with chestnut breast-band and grey belly.

It is distinguished from the similar rufous-throated partridge A. rufogularis by more rufescent crown and head-sides, white gorget and entirely chestnut upper breast.

In 2015, the first photograph of this species in the wild was taken in Arunachal Pradesh.