| Hasselblad Electric Camera | Academic & Science |
| Health Education Campus | Academic & Science |
| Herbarium Eric Coppejans | Academic & Science |
| Haryana Engineering College | Academic & Science |
| Harrisonburg Electric Comission | Academic & Science |
| Heavy Engineering Corporation | Academic & Science |
| Harrisonburg Electric Commission | Academic & Science |
| High Efficiency Compatible | Business |
| Headquarters Entertainment Corporation | Business |
| Hospital Energy Corporation | Business |
| Hellenic Electronic Center | Business |
| Harrisonburg Electric Company | Business |
| Harken Energy Corporation | Business |
| Herolchi Electronic Company | Business |
| High-elongation Carbon | Chemistry |
| Health Enhancement Community | Community |
| Health Education Center | Community |
| Homeownership Education and Counseling | Community |
| Higher Education Center | Community |
| Hautes Etudes Commerciales | Community |
| Higher Education Challenge | Community |
| Hawaiian Educational Council | Community |
| Hotel Ezra Cornell | Community |
| Home Education Convention | Community |
| Handicapped Encounter Christ | Community |
| Home Education Connection | Community |
| Health Enhancement Communities | Community |
| Hillsides Education Center | Community |
| High-end Computer | Computer Hardware |
| Hardware Engineer Conference | Computing |
| Header Error Count | Computing |
| Header Extension Code | Computing |
| Header Error Check | Computing |
| Header Error Correction | Computing |
| High End Computing | Computing |
| Hitachi Enterprise Cloud | Computing |
| Hector DAO | Cryptocurrency |
| Hydrologic Engineering Center | Earth Science |
| Hillside Electronics Corporation | Electronics |
| Headline Example Comment | General |
| Ham Egg and Cheese | General |
| Head Error Control | General |
| Healthy Eaters Club | General |
| HDMI Ethernet Channel | General |
| Harsh Environment Connector | General |
| Houston Emergency Center | General |
| Home Entertainment Center | General |
| High Endurance Cutter | General |
| Horticultural Elephant Controversy | General |
| Healthy Environments Collaborative | General |
| Hybrid Electric Cluster | General |
| Hydrogen Enhanced Combustion | General |
| Hydraulic Elevating Cab | General |
| Hybrid Electronic Cluster | General |
| Holden's Engine Company | General |
| Highly Emetogenic Chemotherapy | General |
| Honda Estilo Club | General |
| Hyundai Engineering Company | General |
| Hawaii Employers Council | Governmental |
| Hunger Energy Cravings | Governmental |
| Hoosier Environmental Council | Governmental |
| Health and Employment Counseling | Governmental |
| Higher Education Commission | Governmental |
| Humanitarian Evacuation Cell | Governmental |
| Harvard Environmental Chamber | Governmental |
| Hunger Energy And Cravings | Governmental |
| HTTP Event Collector | Internet |
| Helicopter Element Coordinator | Military and Defence |
| Header Error Checksum | Networking |
| Header Error Control | Telecommunication |
