CHN may stand for:
* China's country code
**
People's Republic of China
China, officially the People's Republic of China (PRC), is a country in East Asia. With population of China, a population exceeding 1.4 billion, it is the list of countries by population (United Nations), second-most populous country after ...
's ISO 3166-1 alpha-3 and IOC country code
**
Republic of China
Taiwan, officially the Republic of China (ROC), is a country in East Asia. The main geography of Taiwan, island of Taiwan, also known as ''Formosa'', lies between the East China Sea, East and South China Seas in the northwestern Pacific Ocea ...
's IOC country code 1932–1956, now TPE
*
Canadian Health Network
*
Cheshunt railway station, Hertfordshire, National Rail station code
*
CHN analyzer, measuring carbon, hydrogen, and nitrogen
*
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
*
Jeonju Airport, South Korea, IATA airport code
*
Chennai
Chennai, also known as Madras (List of renamed places in India#Tamil Nadu, its official name until 1996), is the capital city, capital and List of cities in Tamil Nadu by population, largest city of Tamil Nadu, the southernmost states and ...
, a megacity in
South India.
* Chemical formula of
hydrogen cyanide
Hydrogen cyanide (formerly known as prussic acid) is a chemical compound with the chemical formula, formula HCN and structural formula . It is a highly toxic and flammable liquid that boiling, boils slightly above room temperature, at . HCN is ...
and
hydrogen isocyanide
*
Climate Heritage Network
{{disambiguation