| LEF | Lafayette Education Foundation 
| Others |
| LEF | Lake Erie Franklin and Clarion Railroad Company
| Others |
| LEF | Lake Erie, Franklin and Clarion Railroad
| Others |
| LEF | Lame Excuse For Filler
| Others |
| LEF | Land Economics Foundation
| Others |
| LEF | Large Event Fund
| Others |
| LEF | Late Expression Factor
| Others |
| LEF | Law Enforcement Foundation
| Others |
| LEF | Leading Edge Forum
| Others |
| LEF | Legacy EGL Framework
| Others |
| LEF | Lexicalized extension formative
| Others |
| LEF | Lexington Education Foundation
| Others |
| LEF | Liberty Equality Fraternity
| Others |
| LEF | Library Exchange Format
| Others |
| LEF | Life Extension Forums
| Others |
| LEF | Life Extension Foundation
| Others |
| LEF | Light Emmitting Film
| Others |
| LEF | Literacy Empowerment Foundation
| Others |
| LEF | Living Endowment Fund
| Others |
| LEF | Load Effect Free
| Others |
| LEF | Load Equivalency Factor
| Others |
| LEF | Local Entrepreneur Forum
| Others |
| LEF | Local Event Flag
| Others |
| LEF | Long Edge Feed
| Others |
| LEF | Loudoun Education Foundation
| Others |
| LEF | Luxury Education Foundation
| Others |
| LEF | Lymphoid Enhancer Factor
| Others |
| LEF | Lymphoid Enhancing Factor
| Others |