| Acronym | Meaning |
| EAST | European Advanced Software Technology |
| EAU | Extended Arithmetic Unit |
| EB | Electric Boat Div Of Gen Dynamics |
| EC | Engineering Change |
| EC | Essentiality Code |
| EC | Electronic Combat |
| ECA | Electronic Component Assembly |
| ECCM | Electronic Counter-countermeasures |
| ECI | Electronic Conversion Interface |
| ECL | Engine Control Lever |
| ECM | Electronic Countermeasures |
| ECMA | European Computer Manufacturer's Associations |
| ECN | Engineering Change Notice |
| ECO | Engineering Change Order |
| ECP | Engineering Change Proposal |
| ECR | Engineering Change Request |
| ECS | Engineering Change Support |
| ECS | Environmental Control System |
| ECU | Environmental Control Unit |
| ED | Engineering Development |
| ED | Executive Director |
| EDMICS | Engineering Data Management Information & Control System |
| EDPU | Electrical Power Drive Unit |
| EDR | Engineering Design Record (release, Review) |
| EDR | Equivalent Direct Radiation |
| EDRS | Engineering Data Retrieval System |
| EDU | Electrical Drive Unit |
| EE | Electrical Engineering |
| EE (E2) | Exponential Elevation |
| EED | Electro-explosive Devices |
| EEE (E3) | Electromagnetic Environment Effects |
| EELS | Emergency Escape Lighting System |
| EEPROM | Electrically Erasable Programmable Read Only Memory |
| EFIS | Electronic Flight Information System |
| EFR | Equipment Facility Requirements |
| EGCS | Environmental Generation & Control System |
| EGT | Exhaust Gas Temperature |
| EHV | Electro Hydraulic Valve |
| EI | Engineering Information |
| EIA | Electronic Industries Association |
| EIA | Electronic Institute Of America |
| EIOP | Extended Input/output Processor |
| EL | Elevation |
| EL | Engineering Laboratory |
| ELEC | Electrical |
| ELEV | Elevation |
| ELF | Communications System |
| ELINT | Electronic Intelligence |
| ELOS | Single Channel Anti-jam |
| EM | Electromagnetic |