| Acronym | Meaning |
| HEA | Health And Environmental Assessment |
| HEAL | Human Exposure Assessment Location |
| HEAS | Health Effects Assessments |
| HEASARC | High Energy Astrophysics Science Archive Research Center |
| HEAST | Health Effects Assessment Summary Tables |
| HEAT | High-Energy Antimatter Telescope |
| HEATRT | Heat Rate [EPRI Software] |
| HEB | High Efficiency Boiler |
| HEBBLE | High Energy Benthic Boundary Layer Experiment |
| HEC | Human Equivalent Concentration |
| HEC | Hydrogen Embrittlement Cracking |
| HECD | Hot Electron Capture Dissociation |
| HECD | Hall Electrolytic Conductivity Detector |
| HED | Howardite-eucrite-diogenite (suite Of Achondrite Meteorites) |
| HEDG | High Efficiency Deep Grinding |
| HEDS | Human Exploration And Development Of Space |
| HEDTA | Hydroxyethylethylenediaminetriacetic Acid |
| HEED | High Energy Electron Diffraction |
| HEEDS | Health And Environmental Effects Documents |
| HEEPS | Health And Environmental Effects Profiles |
| HEGL | High-energy Gas Laser |
| HEGO | Heated Exhaust Gas Oxygen |
| HEI | Highly Exposed Individual |
| HEIR | High Energy Ion Recoil |
| HEIS | High Energy Ion Scattering |
| HEIWIP | Heterojunction Interfacial Workfunction Internal Photoemission |
| HEK | Human Embryonic Kidney |
| HEL | Hugoniot Elastic Limit |
| HEL | Hen Egg Lysozyme |
| HEL | Human Erythroleukemia |
| HELC | High Efficiency Liquid Chromatography (Russian |
| HELP | Hydrologic Evaluation Of Landfill Performance Model |
| HELP | Heuristic Evolving Latent Projection |
| HEM | Human Exposure Model |
| HEM | Heat-exchanger Method (in Manuf. Of Crystalline Silicon) |
| HEMA | Hydroxyethyl Methacrylate |
| HEMPAS | Hereditary Erythroblastic Multinuclearity With Positive Acidified Serum Lysis Test |
| HEMT | High Electron Mobility Transistor |
| HEN | Heat Exchanger Network |
| HEN | High-efficiency Nebulizer |
| HENA | High-energy Neutral Atom |
| HEP | High Energy Physics |
| HEPA | High-efficiency Particulate Air Filter |
| HEPES | N-2-hydroxyethylpiperazine-N'-2-ethanesulfonic Acid |
| HEPPS | 4-(2-hydroxyethyl)-1-piperazinepropanesulfonic Acid) |
| HER | Human Estrogen Receptorpar |
| HER2 | Human Epidermal Growth Factor Receptor 2 |
| HERA | Hadron Electron Ring Accelerator |
| HERAC | Health And Environmental Research Advisory Committee |
| HERCULES | High Efficiency Radiation Counter For Ultimate Low Emission Sensitivity |