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
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