| Harvard Depository Collection | Academic & Science |
| Housing Development Corp | Business |
| Hyderabad Development Center (Microsoft) | Business |
| Hadco Corporation | Business |
| Heritage Distilling Co | Business |
| Houston Development Co | Community |
| Human Development Center | Community |
| Housing Development Center | Community |
| Human Development Commission | Community |
| Housing Development Corporation | Community |
| Hawkins Development Company | Community |
| High Desert Church | Community |
| Heartland Developer Conference | Community |
| Housing Development Consortium | Community |
| Housing Design Center | Community |
| Heartland Developers Conference | Community |
| Hyundai Development Company | Community |
| High Definition Codec (coder-decoder) | Computer Hardware |
| Hard Drive Controller | Computer Hardware |
| Handle-to-device Context | Computer Hardware |
| Handle for Device Context | Computing |
| Handle to a Device Context | Computing |
| Hard Disk Controller | Computing |
| Hardware Data Compression | Computing |
| High Density Connector | Computing |
| High Density Distribution Chassis | Computing |
| High Dependability Computing | Computing |
| High Definition Camera | Computing |
| Hendon Data Centre | Computing |
| Hyderabad Development Center | Computing |
| Huawei Developer Conference | Computing |
| Higher Diploma In Commerce | Educational Degree |
| Hard Disk Crusher | General |
| Honda Dream Cup | General |
| Hordas Do Caos | General |
| Hill Descent Control | General |
| Harley-Davidson Club | General |
| Heavy Duty Cooling System | General |
| Half Double Crochet | General |
| Hand Drive Control | General |
| Heavy Duty Clutch | General |
| Hyundai California Design Centre | General |
| Heavy Duty Chassis | General |
| High Desert Crawlers | General |
| Healey Drivers Club | General |
| Heavy Duty Coolant | General |
| Heavy Duty Emission Cycle | General |
| Hawaii Drivers Club | General |
| Highway Driving Cycle | General |
| in-House Developed Driving Cycle | General |
| Half Dead Clan | General |
| Help Desk Central | General |
| Historic District Commission | General |
| Heavy Duty Compact | General |
| Heavy duty connectors | General |
| Headquarters of Dastardly Criminals | General |
| Hydroelectric Design Center | General |
| Hutch Data Commonwealth | General |
| Hill Decent Control | General |
| Human Dignity Curriculum | General |
| High density color | General |
| High Density Core | General |
| High Danger Chances | General |
| Historic Districts Commission | General |
| Home Detention Curfew | General |
| Holder in Due Course | General |
| Hexamethylene Diamine Carbamate | General |
| Historic District Council | Governmental |
| High-Dose Chemotherapy | Governmental |
| Historic Districts Council | Governmental |
| Hotel Development Council | Governmental |
| HARISHDADPUR PH | Indian Railway Station |
| Hebrew Discovery Center | International |
| Hackers Death Clan | Internet |
| Hospital Dialysis Center | Medical |
| Health Data Consortium | Medical |
| Hackers Dot Com | Messaging |
| Helicopter Direction Center | Military and Defence |
| Harbor Defense Commander | Military and Defence |
| Hierarchical Domain Controller | Networking |
| Hasselblad Data Camera | Space Science |
| Hybrid Device Controller | Space Science |
