| Acronym | Definition |
|---|
| FEF | Front End Friday (car photography) |
| FEF | Foundation for Economic Freedom (Philippines) |
| FEF | Federación Ecuatoriana de Fútbol (Spanish, Ecuador) |
| FEF | Forced Expiratory Flow (lung function) |
| FEF | Frontal Eye Field |
| FEF | Fernow Experimental Forest (research forest; West Virginia) |
| FEF | File Exchange Format |
| FEF | Foundry Educational Foundation |
| FEF | Fédération des Etudiants Francophones (French: Federation of Francophone Students) |
| FEF | Free Enterprise Fund |
| FEF | Free Enterprise Foundation |
| FEF | Florida Education Foundation |
| FEF | Familia Educadora en la Fe (Spanish: Faith Family Educator; Mexico) |
| FEF | Flexible Elastomeric Foam |
| FEF | Flèches Électroniques France (French dart club) |
| FEF | Fix Effectiveness Factor (methodology) |
| FEF | Free Earth Foundation (Doylestown, PA) |
| FEF | Front End Fee |
| FEF | Fundación Europea de Formación (Spanish) |
| FEF | Future Engineer Force |
| FEF | France Europe Formation (French: Europe France Training) |
| FEF | French Erotic Film |
| FEF | Fastest Edge First (algorithm) |
| FEF | Familial Erythrophagocytic Lymphohistiocytosis |
| FEF | Functional Evaluation Flight |
| FEF | Fuel Examination Facility |
| FEF | Front Endpaper (book) |
| FEF | Family of Equipment Failure (Nortel) |
| FEF | Failure of Equipment Family (Alcatel) |
| FEF | Fabrique d'Ebauche de Fleurier (French: Factory Outline Fleurier; watch movement) |