| Acronym | Definition |
|---|
| HEI | High Energy Ignition (GM) |
| HEI | Higher Education Institution (UK) |
| HEI | House Ear Institute |
| HEI | Hautes Études Internationales |
| HEI | Hill Enterprises, Inc. (Santa Barbara, CA) |
| HEI | High Energy Ignition |
| HEI | Health Effects Institute |
| HEI | Healthy Eating Index |
| HEI | High-Explosive Incendiary |
| HEI | Hautes Etudes d'Ingénieur |
| HEI | HIV-Exposed Infant |
| HEI | Healthcare Equality Index |
| HEI | Higher Education Information |
| HEI | High Efficiency Incandescent (lighting) |
| HEI | Human-Environment Interaction (environmental sociology) |
| HEI | Hankyu Express International (Japan) |
| HEI | Hazardous Energy Isolation |
| HEI | Habitat Enhancement Initiative |
| HEI | Henderson Engineers Inc (Lenexa, KS) |
| HEI | Hosted Enterprise Infrastructure |
| HEI | High Energy Ionizer |
| HEI | High Energy Intermediate |
| HEI | Heat Exchange Institute Inc. |
| HEI | Houston Engineering, Inc. (Fargo, ND) |
| HEI | Howard Electronic Instruments (El Dorado, KS) |
| HEI | Human Exploration Initiative |
| HEI | Harlan-Evans Inc (Bentonville, VA) |
| HEI | Hobby Express Importers |
| HEI | Hunter Environmental Institute (Australia) |
| HEI | Hettinger, ND, USA - Hettinger Municipal (Airport Code) |