| Acronym | Meaning |
| EFVAO | Electric-field Variant Atomic Orbital |
| EG | Ethylene Glycol |
| EGA | Evolved Gas Analysis |
| EGAMS | Evolved Gas Analysis Mass Spectroscopy |
| EGBD | Extrinsic Grain Boundary Dislocation |
| EGCG | Epigallocatechin Gallate |
| EGCI | Exponentially Generated Configuration Interaction |
| EGCM | Eddy-Resolving General Circulation Model |
| EGCR | Experimental Gas-cooled Reactor |
| EGD | Evolved Gas Detection |
| EGDN | Ethylene Glycol Dinitrate |
| EGF | Epidermal Growth Factor |
| EGFP | Enhanced Green Fluorescent Protein |
| EGFR | Epidermal Growth Factor Receptor |
| EGM | Electron Gas Model |
| EGO | Ellipsoidal Gaussian Orbital |
| EGO | Exhaust Gas Oxygen |
| EGP | Evolved Gas Profile |
| EGR | Exhaust Gas Recirculation |
| EGRET | Energetic Gamma Ray Experiment Telescope |
| EGRIS | Emissive Gamma-ray Imaging And Spectroscopy |
| EGS | Echelle Grating Spectrometer |
| EGSB | Expanded Granular Sludge Bed |
| EGTA | Ethylene Glycol Bis(2-aminoethyl Ether)-N |
| EGU | European Geosciences Union |
| EGW | Electrogas Welding |
| EH | Extended Hueckel |
| EHAP | Extremely Hazardous Air Pollutant |
| EHB | Extended Hubbard (hamiltonian) |
| EHC | Environmental Health Committee |
| EHCO | Extended Hueckel Crystal Orbital |
| EHEC | Enterohemorrhagic Escherichia Coli |
| EHF | Extended Hartree-Fock |
| EHLS | Environmental Health Laboratory Sciences |
| EHM | Extended Hubbard Model (hamiltonian) |
| EHMI | Environmental Hazards Management Institute |
| EHMO | Extended Hueckel Molecular Orbital |
| EHN | Environmental Health Network |
| EHP | Electron-hole Plasma |
| EHP | Electron-hole Potential Method |
| EHS | Environment |
| EHS | Extremely Hazardous Substance |
| EHSO | Environmental Health And Safety Online |
| EHT | Extended Hueckel Theory |
| EHW | Extremely Hazardous Waste |
| EI | Electron Impact |
| EI | Emissions Inventory |
| EIA | Energy Information Administration (DOE) |
| EIA | Eikonal Impulse Approxn. (in Ion-atom Inelatic Collisions) |
| EIA | Environmental Impact Assessment |