| Acronym | Definition |
|---|
| ECWG | Extreme Cold Weather Gear |
| ECWG | Earth Cover Working Group |
| ECWG | Export Controls Working Group |
| ECWG | Emergency Communications Working Group |
| ECWG | Environmental Communications Working Group |
| ECWG | Engineering Change Working Group |
| ECWG | Electronic Combat Working Group |
| ECWG | Electromagnetic Compatibility Working Group (IEEE Power Engineering Society) |
| ECWG | Explorers Club Washington Group (McLean, VA) |
