| Acronym | Definition |
|---|
| AEF | American Expeditionary Force |
| AEF | Air Expeditionary Force(s) |
| AEF | Advertising Educational Foundation |
| AEF | Air and Space Expeditionary Force (USAF, formerly Aerospace Expeditionary Force) |
| AEF | Afrique Equatoriale Francaise (French Equatorial Africa) |
| AEF | Aggregate External Finance |
| AEF | Aerospace Expeditionary Force (USAF, now Air and Space Expeditionary Force) |
| AEF | Aerospace Education Foundation (Air Force Association) |
| AEF | Allied Expeditionary Force |
| AEF | Asia Education Foundation |
| AEF | American Eagle Foundation |
| AEF | Amyloid-Enhancing Factor |
| AEF | Access Control Enforcement Function |
| AEF | Air Experience Flying |
| AEF | American Endowment Foundation (Hudson, OH) |
| AEF | Africa Enterprise Fund |
| AEF | Accurate Environmental Forecasting, Inc (Narragansett, RI, USA) |
| AEF | Aerospace Engineering Facility |
| AEF | Advanced Electronics Field |
| AEF | Application Extension Facility (IBM) |
| AEF | All Else Failed (band) |
| AEF | Aurora Education Foundation (Aurora, CO) |
| AEF | Aeromedical Evacuation Flight |
| AEF | About Extra Fine (coin grading) |
| AEF | Accreditation Evaluation Form |
| AEF | Atmospheric Electric Field |
| AEF | American Enuresis Foundation |
| AEF | Airborne Equipment Failure |
| AEF | Argonne Experimental Facility |
| AEF | Atmosphere Environmental File |
| AEF | Area Enhancement Factor |
| AEF | Active Emitter File |
| AEF | Auxiliary Electrician Forward |
| AEF | Active Element Factor |
| AEF | Alternative Electronic Filing |