| FEF | Falmouth Education Foundation 
| Others |
| FEF | Familia Educadora en la FE
| Others |
| FEF | Fast Extrusion Furnace
| Others |
| FEF | Federation Elite Force
| Others |
| FEF | Financial Education Fund
| Others |
| FEF | Finite Elements in Flow
| Others |
| FEF | Finite Elements in Fluids
| Others |
| FEF | Flexible Elastomeric Foam
| Others |
| FEF | Florida Earth Foundation
| Others |
| FEF | Florida Education Fund
| Others |
| FEF | Fluorescence Enhancement Factor
| Others |
| FEF | Fondazione Ezio Franceschini
| Others |
| FEF | Forced Expiratory Flow
| Others |
| FEF | Ford Easy Fuel
| Others |
| FEF | Foundation for Economic Freedom
| Others |
| FEF | Foundry Educational Foundation
| Others |
| FEF | Four Eight Four
| Others |
| FEF | Free Entitlement Funding
| Others |
| FEF | Fremont Education Foundation
| Others |
| FEF | Fried Egg Flowers
| Others |
| FEF | Friends of the Environment Foundation
| Others |
| FEF | Frisco Education Foundation
| Others |
| FEF | Front End Friday
| Others |
| FEF | Frontal Eye Field
| Others |
| FEF | Frontal eye fields
| Others |
| FEF | Frontier Education Foundation
| Others |
| FEF | FSN Execution Framework
| Others |
| FEF | Full Enhancement Filter
| Others |
| FEF | Function Entry Frame
| Others |
| FEF | Future Energy Forum
| Others |
| FEF | Future Extension Frame
| Others |