AH

AH may mean:

After Hours, in reference to stock trading
Air Algérie (IATA airline designator)
Anno Hegirae, indicating that a date is from the Islamic calendar
Apocalyptic Harbingers, A clan on Battle.net
Attack Helicopter (U.S. military designation; e.g. AH-1 Cobra)
Auction House, especially in many MMORPGs
Authentication Header, the IPsec protocol designed to guarantee integrity and authenticity
Avalon Hill (more properly TAHGC, "The Avalon Hill Game Company"), pioneering American publisher of wargames (1958–1998), whose brand name is now used by Hasbro/Wizards of the Coast
Hospital Ship (US Navy hull classification symbol)
US Navy attack bomber designation for the F-4 Phantom II
Adolf Hitler
American History
After Hijra, refers to the years after Muhammad made the pilgrimage to Medina; used in the Islamic calendar
Ayumi Hamasaki, a J-pop artist.

Ah may mean:

ampere-hour, an unit of electric charge

aH may mean:

atto henry, an SI unit of inductance

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