| Abbreviation | Definition |
|---|---|
| EMU | Extended Memory Unit |
| EMU | Extravehicular Mobility Unit |
| EMU-TV | Extravehicular Mobility Unit - Television |
| E-MUX | Electrical MUltipleXer |
| ENA | ENAble |
| ENC | ENCode |
| ENCD | Encode |
| ENCL | ENCLose |
| ENDEFF | END EFFector |
| ENDF | Evaluated Neutron Data File |
| ENG | ElectroNystagnoGram |
| ENG | ENGine |
| ENG | Engineer |
| ENGRG | ENGineeRinG |
| ENT | ENTry |
| ENVIR | ENVIRonment |
| EO | Earth Observation |
| EO | Earth Orbit |
| EO | Electro-Optics |
| EO | Engine Out |