MEF
- 1st Marine Expeditionary Force
- 2nd Marine Expeditionary Force
- 3rd Marine Expeditionary Force
- Energy Star
- Fibroblast
- First World War
- MEF International School Istanbul
- Mahratta Education Fund
- Major Economies Forum on Energy and Climate Change
- Malaita
- Malaita Eagle Force
- Managed Extensibility Framework
- Marine Expeditionary Force
- Maximum Elevation Figure
- Media Education Foundation
- Medial eye fields
- Mediterranean Expeditionary Force
- Mei Foo station
- Mesopotamian Expeditionary Force
- Metro Ethernet Forum
- Middle East Forum
- Ministerio de Economía y Finanzas
- Ministero dell’Economia e delle Finanze
- Ministry of Economy and Finance (Peru)
- Ministry of Environment and Forests
- Mission Essential Functions
- Modernized e-File
- Mouse Embryonic Fibroblast
- Multiscale Electrophysiology Format
- Museo Paleontológico Egidio Feruglio
- Myocyte Enhancer Factor
- Solomon Islands