| Acronym | Meaning |
 | EM | Electron Microscope |
| EM | Evaluation Model |
| EM-SCATTERING | Electromagnetic Scattering |
| EMA | Electrodynamics Of The Middle Atmosphere |
| EMA | Extended Memory Addressing |
| EMACS | An On-line Text Editor Distributed As Part Of The GNU Package Of UNIX Software |
| EMAD | Equatorial Middle Atmosphere Dynamics |
| EMAP | Environmental Monitoring And Assessment Program |
| EMC | Environmental Modeling Center |
| EMCOM | Environmental Management Career Opportunities For Minorities |
| EMCORE | Environmental Management Center Opportunities Resource |
| EMDS | Emergency Management Decision Support System |
| EMEP | European Model And Evaluation Program |
| EMEX | Equatorial Monsoon Experiment |
| EMEX | Equatorial Mesoscale Experiment |
| EMF | Electromotive Force |
| EMF | Electromagnetic Field/force |
| EMG | Electromagnetic Gravity Data |
| EMI | Electomagnetic Interference |
| EMI | Electromagnetic Radiation Interference |
| EMMP | Environmental Monitoring And Mitigation Plan |
| EMO | Elk Mountain Observatory |
| EMO | Emergency Management Office |
| EMO | Environmental Management Office |
| EMP | Electromagnetic Pulse |
| EMR | Electomagnetic Radiation |
| EMR | Electronic Mail Registration |
| EMRO | Emergency Management & Response Office |
| EMSES | Electromagnetic Modeling And Simulation Environment For Systems |
| EMU | Electromagnetic Units |
| EMU | Electromotive Unit |
| ENAC | Energetic Neutral Atom Camera |
| ENACEOS | Energetic Neutral Atom Camera For EOS |
| ENCAR | Enclosed Cryopump For Air Sample Recovery |
| ENDEX | Environmental Data Index |
| ENEA | Comitato Nazionale Per La Ricerca E Lo Sviluppo Dell' Energia Nucleare E Delle Energie Alternative |
| ENRI | Electronic Navigation Research Institute |
| ENS | European Nuclear Society |
| ENSO | El Ni-o-Southern Oscillation |
| ENSTROPHY | N/A |
| ENVISAT | European Environmental Satellite |
| EO | Office Of Education And Outreach |
| EO | Ethylene Oxide |
| EO-ICWG | Earth Observation International Coordination Working Group |
| EOB | Executive Office Building |
| EOC | Earth Observation Center |
| EOC | EOS Operations Center |
| EOCAP | Earth Observations Commercialization Applications Program |
| EODC | Earth Observation Data Centre |
| EOF | Empirical Orthogonal Function |
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