AIH

• Air Incheon (ICAO airline designator AIH)
• Ai-Cham language, ISO 639-3 code

• American Institute of Homeopathy (AIH), established in 1844, is the oldest extant national physician's organization in the United States
• Autoimmune hepatitis, a human disease

• American IronHorse, an American motorcycle manufacturer

• As It Happens, a Canadian radio news program broadcast on CBC Radio One

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