CHN may stand for:

• 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
• 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, a megacity in South India.
• Chemical formula of hydrogen cyanide and hydrogen isocyanide
• Climate Heritage Network