| Abbreviation | Definition |
|---|---|
| ENM | Emergency Notification Message |
| ENQ | Enquire |
| ENS | Ensign - USN |
| ENSCE | Enemy Situation Correlation Element |
| ENSIT | Enemy Situation |
| ENSS | Emergency Notification System Support |
| ENT | Enterprise |
| ENTAC | ENgin Téléguidé Anti-Char |
| ENTF | Eastern Naval Task Force |
| ENTNAC | Entrance National Agency Check |
| ENWGS | Enhanced Naval Warfare Gaming System |
| EO | Electro-Optic |
| EO | Electro-Optical |
| EO | End Office |
| EO | Engagement Operations |
| EO | Engine Operation |
| EO | Equal Opportunity |
| EO | Essential Oil |
| EO | Excessive Overkill |
| EO | Extreme Offensive |