CHN may stand for:
Places China's country code People's Republic of China's ISO 3166-1 alpha-3 and IOC country code Republic of China's IOC country code 1932–1956, now TPE Chennai, state capital of Tamil Nadu, India Jeonju Airport, South Korea, IATA airport code Cheshunt railway station, Hertfordshire, UK, by National Rail station code
Networks Canadian Health Network City Hindus Network, London, UK Anglican religious orders Community of the Holy Name, an Anglican religious order for women in England, Lesotho and South Africa Community of the Holy Name (Australia), an Anglican religious order for women in Australia, unrelated to the English order Climate Heritage Network
Chemistry
CHN analyzer, measuring carbon, hydrogen, and nitrogen Chemical formula of hydrogen cyanide and hydrogen isocyanide
Language
Chinook Jargon (ISO 639: chn), trade language in the Pacific Northwest region of the U.S. and Canada