AH
- aH – (s) Attohenry
- Ah – (s) Ampere-hour
- AH – (i) Attack Helicopter
- AHA – (i) American Heart Association
- AHCPR – (i) Agency for Health Care Policy and Research (obsolete; replaced with AHRQ)
- AHEC – (i) Australian Health Ethics Committee
- AHPCRC – (i) Army High Performance Computing Research Center
- AHQ – Air Headquarters
- AHRQ – (i) Agency for Healthcare Research and Quality
- AHS – (i) American Housing Survey
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