EF

• Ef (band), a post-rock band from Sweden • Ef: A Fairy Tale of the Two., a Japanese adult visual novel series by Minori, or its anime adaptations ==Businesses and organizations==

• Eagle Forum, an anti-feminist conservative interest group • Earth First!, movement, in environmentalism • Eastern Fare, a music institution and production house in Bangalore, India • EF Education First, an international education organization • The Elias Fund, a non-profit organization • Far Eastern Air Transport (IATA code EF) == Linguistics ==

• Ef (Cyrillic) (Ф, ф), a letter in the Cyrillic alphabet • F (F, f), a letter in the Latin alphabet ==Science==

Biology and psychology • Ejection fraction, in cardiovascular physiology • Elongation factors, proteins that are important in protein synthesis • Executive functions, a theorized cognitive system in psychology that controls and manages other cognitive processes Physics • Electric field, in physics • Exafarad, an SI unit of electric capacitance • Fermi energy or Fermi level (EF), both concepts in quantum mechanics Other sciences • Ecological footprint, the measure of the demand the population has on the environment • Enhanced Fujita scale (EF scale), an improved version of the Fujita scale used to rate the intensity of tornadoes • Ice cap climate, which is abbreviated to EF in the Köppen climate classification ==Technology==

• Canon EF camera, a manual focus 35mm SLR • Canon EF lens mount, Canon's autofocus lens mount • Entity Framework, an object-relational mapping (ORM) framework for the .NET Framework ==Other uses==

• Extraordinary Form, a phrase used to describe the Catholic liturgy of the 1962 Roman Missal • Era Fascista, the Italian fascist calendar • Extra fine, a condition of a coin • Eurofurence, a furry convention in Berlin, Germany