| Abbreviation | Definition |
|---|---|
| H&E | Hemorrhage And Exudate |
| H&E | Hematoxylin and Eosin (stain) |
| H&P | History and Physical |
| H-PFQ | Hierarchical Packet Fair Queueing |
| H.C.F. | Highest Common Factor |
| H2O | Water |
| HA | High Altitude |
| HA | Hazard Analysis |
| HAA | HaloAcetic Acid |
| HAA | Hepatitis Associated Antibodies |
| HAA | High Altitude Abort |
| HAA | High Altitude Airship |
| HAA | Hearing Aid Amplifier |
| HAARP | High Altitude Auroral Research Program |
| HAART | Highly Active Anti Retroviral Therapy |
| HAART | Highly Active Anti Retroviral Treatment |
| HAB | Haberdasher |
| HABF | Hepatic Artery Blood Flow |
| HABIT | Hips, Abdominals, Butts, and Incredible Thighs |
| HABT | Habitability Technology |
| HAC | Heading Alignment Cylinder |
| HAC | Heading Alignment Cone |
| HAC | Heading Alignment Circle |
| HAC | Heading Alignment Center |
| HAC | Humanitarian Action in Crises |
| HACA | Human Antichimeric Antibodies |
| HACB | Housing Authority of the County of Beaver |
| HACB | Housing Authority of the City of Beaumont |
| HACB | Housing Authority of the County of Butte |
| HACBSS | Homestead and Community Broadcasting Satellite Service |
| HACCP | Hazard Analysis and Critical Control Point |
| HACCP | Hazard Analysis Critical Control Point |
| HACR | High Accuracy Cryogenic Radiometer |
| HACS | Health And Community Studies |
| HAD | Help Desk Analyst |
| HAD | Heat Actuated Device |
| HAE | Hereditary Angioedema |
| HAE | Hearing Aid Evaluation |
| HAEC | Human Aortic Endothelial Cell |
| HAER | Historical Architectural Engineering Report |
| HAFB | Holloman Air Force Base |
| HAFE | High Altitude Flatus Expulsion |
| HAGS | Herpes, AIDS, Ghonorrea, Syphilis |
| HAH | Halt And Hang |
| HAI | Health Action International |
| HAI | Hospital Acquired Infection |
| HAINS | High-Accuracy Inertial Navigation System |
| HAINS | High Accuracy Inertial Navigation System |
| HAK | Horizontal Access Kit |
| HAK | Hamster Kidney |