AH

AH (also Ah or ah) may refer to:

• Ah (digraph), a digraph used in Taa orthography
• Adolf Hitler (1889-1945), Austrian born dictator of Nazi Germany and leader of the NSDAP
• After-hours trading in stock trading
• Air handler, or air handling unit (AHU), a device used to condition and circulate air
• Albert Heijn, a Dutch supermarket chain owned by Ahold
• Ampere-hour, a unit of electric charge
• Anhui, a Chinese province
• Asian Highway
• Attohenry (aH), an SI unit of inductance
• Auction house
• Austria–Hungary, a former European empire
• Hijri year (Anno Hegirae) in the Islamic calendar
• Adenomatous hyperplasia; see endometrial adenomatous hyperplasia and atypical adenomatous hyperplasia