Gan may refer to:
- A Romanization of the Chinese character 甘 (Gān), an abbreviation for Gansu Province in the People's Republic of China
- A Romanization of the Chinese character 赣 (Gàn), an abbreviation for:
- Gan River
- Jiangxi Province in the People's Republic of China, through which the river flows
- Gan (linguistics) varieties of Chinese, which are concentrated in and form the typical speech of Jiangxi
- Gan (Stephen King), the creative overforce in The Dark Tower series by Stephen King
- GAN (cycling team), a French cycling team
- GaN, Gallium(III) nitride, a direct-bandgap semiconductor material of wurtzite crystal structure
In places:
- Gan, Norway, a village in Fet in Norway
- Gan, Pyrénées-Atlantiques, a commune in the Pyrénées-Atlantiques département in France
- Gan (Gaafu Dhaalu Atoll), Republic of Maldives
- Gan (Laamu Atoll), Republic of Maldives
- Gan (Seenu Atoll), Republic of Maldives
- Gan International Airport, Maldive by IATA code
- Gananoque, Ontario, Canada, by local nickname
In fictional characters:
- Olag Gan, a fictional character in the British television series Blake's 7
- Gan Isurugi, a fictional character from the Rival Schools video game series
GAN as an acronym may refer to:
- Generic Access Network formerly known as Unlicensed Mobile Access (UMA)
- Giant axonal neuropathy and is also the name of the gene that when mutated causes the disorder.
- Global Area Network
