CHN may stand for:

  • People's Republic of China's ISO 3166-1 alpha-3 and IOC country code
  • Republic of China's IOC country code between 1932–1956, now TPE
  • Canadian Health Network, a Canadian bilingual health promotion service
  • Cultural Heritage Organization of Iran (CHN)
  • CHN analyzer, can measure the elements carbon (C), hydrogen (H), and nitrogen (N)
  • Chimerin, a type of nerve tissue protein