MEF

• Mission Essential Functions - critical operations of the US government in the face of unexpected disruption

• Malaita Eagle Force, a militant organization originating in the island of Malaita in the Solomon Islands
• Marine Expeditionary Force (MEF), one of the major deployable subdivisions of the United States Marine Corps; see 1st Marine Expeditionary Force, 2nd Marine Expeditionary Force, 3rd Marine Expeditionary Force
• Mediterranean Expeditionary Force
• Mesopotamian Expeditionary Force during the First World War

• Mahratta Education Fund, Indian non-profit organisation
• Major Economies Forum on Energy and Climate Change
• Media Education Foundation
• MEF International School Istanbul
• Middle East Forum, an American conservative think tank
• Ministerio de Economía y Finanzas, the Peruvian ministry of economics and finance
• Ministerio de Economía y Finanzas, the Uruguayan ministry of economics and finance
• Ministero dell’Economia e delle Finanze, the Italian ministry of economics and finance
• Ministry of Environment and Forests, India

• Managed Extensibility Framework, a software plugin framework, written by Microsoft
• Maximum Elevation Figure (flying)
• Maximal expiratory flow, another name for peak expiratory flow in spirometry
• Medial eye fields
• Metro Ethernet Forum
• Modernized e-File (MeF), an electronic system for filing U.S. income taxes
• Modified Energy Factor (Energy Star Rating Value, US Department of Energy (DOE))
• Mouse Embryonic Fibroblast
• Museo Paleontológico Egidio Feruglio collection code
• Myocyte Enhancer Factor (2)
• Mouse Embryonic Fibroblast (MEF) Isolation Enzyme 1
• Multiscale Electrophysiology Format, a data format used in electrophysiology

• Mei Foo station, Hong Kong, MTR station code

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