| HDAC | Heating Dehumidification and Air Conditioning | |
| HDAD | Hybrid Digital Audio Disc | |
| HDAD | Hybrid DVD Audio Disc | |
| HDAD | Heavy Duty Aftermarket Dialogue | |
| HDAD | High Definition Audio Device | |
| HDAD | Health District After Dark | |
| HDAE | Harbin Dongan Automotive Engine | |
| HDAFU | Home Draw Away Favourite Underdog | |
| HDAM | Hierarchical Direct Access Method | |
| HDAPSD | Hard Drive Active Protection Disk Head Parking Daemon | |
| HDAS | Heavy- Duty Auxiliary Stand | |
| HDAS | Heavy- Duty Auxiliary Stand | |
| HDAS | Hillingdon Drug and Alcohol Services | |
| HDAS | Hillingdon Drug Alcohol Services | |
| HDAS | Historical Dictionary of American Slang | |
| HDAS | Healthcare Databases Advanced Search | |
| HDAS | Horsham Debt Advice Service | |
| HDAS | Houston Dental Assistant School | |
| HDAS | Huddersfield and District Archaeological Society | |
| HDAS | Hydrographic Data Acquisition System | |
| HDAS | Historical Dictionary of American Slang | |
| HDAS | Human Development and Aging Services | |
| HDAS | Herpetofaunal Disease Alert System | |
| HDAS | High Density Amphenol Socapex | |
| HDAT | Hill Dance Academy Theatre |
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