AH and variants may refer to:

• Ah!, an exclamation
• AH (Anno Hegirae), Latin for Islamic "in the year of the Hijra" similar to the Latin for the Christian year Anno Domini

Music

• "Ah", song by Charles Aznavour written by Charles Aznavour and José Lucchesi 1954
• "Ah" (song), a Japanese song by Superfly
• "Ah", a song by the Turkish band Duman 2002

Games and literature

• Achievement Hunter, a Texas-based online video gaming community
• Adam Hughes, a comic artist who signs his work "AH!"
• Alternate history, a subgenre of speculative fiction
• Arcana Heart, a video game series
• Avalon Hill, makers of military-themed board games

Places

• Afghanistan, World Meteorological Organization country code
• Anhui, a province of China (Guobiao abbreviation AH)
• Austria-Hungary, a former European empire

Aviation

• Air Algérie IATA designator
• Artificial Horizon, an attitude indicator, a cockpit instrument (Aviation)
• Bell AH-1 Cobra, a model of attack helicopter
• Boeing AH-64 Apache, a model of attack helicopter

Computing

• AH register, the high byte of an X86 16-bit AX register
• Authentication Header (AH), a part of the IPsec protocol suite

Disease, ventilation and electricity

• Adenomatous hyperplasia; see endometrial adenomatous hyperplasia and atypical adenomatous hyperplasia
• Air handler, or air handling unit (AHU), a device used to condition and circulate air
• Ampere hour, a unit of electric charge

Other fields

• Aegyptiaca Helvetica, an archaeological journal published by Schwabe (publisher)
• Ah (digraph), a digraph used in Taa language orthography
• Albert Heijn, a Dutch supermarket chain owned by Ahold
• Alkotmányvédelmi Hivatal, the Constitution Protection Office, a Hungarian intelligence agency
• Asian Highway Network, a project among countries in Asia and Europe to improve the highway systems in Asia
• A US Navy hull classification symbol: Hospital ship (AH)

See also

• AAH (disambiguation)
• AHH (disambiguation)
• A-ha, a New Wave/Synthpop band from Norway
• Aa! Japanese band
• All pages with titles beginning with AH
• All pages with titles containing AH
• Ah Ah Ah (disambiguation)