| IEF | electrofocusing 
| Others |
| IEF | Igni Et Ferro
| Others |
| IEF | Image Editing Fun
| Others |
| IEF | Image Enhancement Factor
| Others |
| IEF | Image Exchange Format
| Others |
| IEF | Image Exchange Format Bitmap graphics
| Others |
| IEF | Image File
| Others |
| IEF | Imaging Energy Filter
| Others |
| IEF | IMDEA Energy Framework
| Others |
| IEF | Index of Economic Freedom
| Others |
| IEF | Indian Equity Fund
| Others |
| IEF | Indigenous Education Foundation
| Others |
| IEF | Industrial Environmental Forum
| Others |
| IEF | Information Engineering Facility
| Others |
| IEF | Information Exchange Framework
| Others |
| IEF | Initial Entry Force
| Others |
| IEF | Institute of Electromagnetic Fields
| Others |
| IEF | Instituto de Estudios Fiscales
| Others |
| IEF | Integral Equation Formalism
| Others |
| IEF | Integrated Education Fund
| Others |
| IEF | Integrity Enhancement Facility
| Others |
| IEF | Interest Earning Facility
| Others |
| IEF | International Ecumenical Fellowship
| Others |
| IEF | International Egg Foundation
| Others |
| IEF | International Elephant Foundation
| Others |
| IEF | International Energy Forum
| Others |
| IEF | International Entrepreneurship Forum
| Others |
| IEF | International Expeditionary Force
| Others |
| IEF | International Eye Foundation
| Others |
| IEF | Internet Evidence Finder
| Others |
| IEF | Internet Exchange File
| Others |
| IEF | Inuvialuit Education Foundation
| Others |
| IEF | Inverse Element Frequency
| Others |
| IEF | Inverse Expertise Frequency
| Others |
| IEF | IPC E Forum
| Others |
| IEF | Iso-Electric Focusing
| Others |
| IEF | Isoelectric focusing
| Others |
| IEF | Iterative Error Feedback
| Others |