EF

EF or ef may refer to:

Arts and entertainment

 * 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

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 auto-focus 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