| Abbreviation | Definition |
|---|---|
| HDT | Haus Der Technik |
| HDVI | Health Data Vision Inc |
| HDW | Howaldtswerke Deutsche Werft |
| HEAC | Happily Ever After Confectionery |
| HEAI | Hybrid Energy Advisors Inc |
| HEC | Harrisonburg Electric Company |
| HEC | Headquarters Entertainment Corporation |
| HEC | Hellenic Electronic Center |
| HEC | Herolchi Electronic Company |
| HEC | Hospital Energy Corporation |
| HECO | Hawaiian Electric Company, Inc. |
| HECS | HealthEast Care System |
| HEDC | Hamden Economic Development Corporation |
| HEDC | Hastings Economic Development Corporation |
| HEDC | Havenwoods Economic Development Corporation |
| HEDC | Heiltsuk Economic Development Corporation |
| HEDC | Hereford Economic Development Corporation |
| HEDC | Hilltop Economic Development Corporation |
| HEDIC | Health Electronic Data Interchange Corporation |
| HEDIC | Holyoke Economic Development and Industrial Corporation |