| Acronym | Definition |
|---|
| HAD | HIV (Human Immunodeficiency Virus) Associated Dementia |
| HAD | Hospitalisation à Domicile (French: Home Hospitalization) |
| HAD | Home Affairs Department (Hong Kong) |
| HAD | Hole Accumulation Diode (Sony) |
| HAD | Hole Accumulated Diode (Sony) |
| HAD | Human Adenovirus (pathogen) |
| HAD | Humanitarian Aid & Development (various locations) |
| HAD | Hearing Aid Dispenser |
| HAD | Hole Accumulation Diode |
| HAD | 3-Hydroxyacyl-CoA Dehydrogenase (deficiency) |
| HAD | Harrow Association of Disabled (UK) |
| HAD | Health Assessment Document |
| HAD | Hemadsorption (laboratory virus testing) |
| HAD | Hebrew Association of the Deaf (Philadelphia, PA) |
| HAD | Human Adjuvant Disease |
| HAD | Atlantic Haddock |
| HAD | Hospital Anxiety Depression |
| HAD | Homeland Air Defense |
| HAD | Hardware Data Acquisition |
| HAD | Hubble Data Archive |
| HAD | Headbangers Against Disco |
| HAD | Halmstad, Sweden - Halmstad (Airport Code) |
| HAD | Heinemann Australian Dictionary |
| HAD | High Availability Device |
| HAD | Heat Activated Device |
| HAD | High Aluminum Defect |
| HAD | Harness Assembly Drawing (electrical wire assembly drawing for manufacturing of cable harness assemblies) |
| HAD | Heat Acquisition Devices |
| HAD | Horizontal Acoustic Depiction |
| HAD | Heated Air Ducting |