Gàn (simplified Chinese: 赣语; traditional Chinese: 贛語; Gan: Gon ua), alternatively Jiangxinese (Chinese: 江西话 Jiāngxī huà; Gan: Kongsi ua) is spoken as the native language by around 50 million people in the Jiangxi province of China, as well as important population in surrounding regions such as Hunan, Hubei, Anhui and Fujian. Gan is a member of the Sinitic languages of the Sino-Tibetan language family and Hakka is the closest language to Gan in terms of phonetics.

Different dialects of Gan exist, and the representative dialect is the Nanchang dialect.

The classification of Gan is subject to debate. Like all other varieties of Chinese, there is a large amount of dispute as to whether Gan is a language or a dialect. There are three dominant views:

See also: Identification of the varieties of Chinese for the issues surrounding this dispute.

Most of Gan speakers live in the middle and lower reaches of Gan River, the drainage area of the Fu River and the region of Poyang Lake. There are also many Gan speakers living in eastern Hunan, eastern Hubei, southern Anhui and northwest Fujian, etc.