| Abbreviation | Definition |
|---|---|
| ELF | Extremely Low Frequency (30 - 300 Hz) |
| ELINT | ELectronic signals INTelligence |
| ELL | Early Lunar Lander |
| ELM | Extended Lunar Mission |
| ELMCH | ELectro-MeCHanical |
| ELMECH | ELectro-MECHanical |
| ELMS | Elastic Loop Mobility System |
| ELMS | ELeMentS |
| ELS | Earth Landing System |
| ELS | Eastern Launch Site |
| ELS | Elevon Load System |
| ELS | Emergency Landing Site |
| ELS | Energy Loss Spectroscopy |
| ELSC | Earth Landing Sequence Controller |
| ELSS | Emergency Life Support System |
| ELV | Earth Launch Vehicle |
| ELV | ELectrically-operated Valve |
| ELVIS | Expendable Launch Vehicle Integrated Support |
| ELVN | ELeVeN |
| ELW | Emergency Landing Weight |