AF

AF, af, Af, etc. may refer to:

Arts and entertainment

 * Af, one of the Angels of Punishment, a mythical character outlined in Gustav Davidson's 1967 book A Dictionary of Angels, Including the Fallen Angels
 * A.F. (band), a Swiss punk rock band started in 1992 and originally named Allpot Futsch
 * A-F Records, an independent record label in Pittsburgh, Pennsylvania, US, founded by the band Anti-Flag
 * Almost Family episode titles tend to be "[Adjective] AF"

European

 * ÅF, a Swedish technical consulting company
 * AF Gruppen, a multinational construction and development company based in Norway
 * Académie française, the official institution responsible for overseeing the French language
 * Action Française, a French far right political movement
 * Anarchist Federation (British Isles), an Anarchist-Communist agitational organisation in Britain

International

 * Abercrombie & Fitch, an American-based, international clothing retailer
 * Air France (IATA airline code and Euronext stock symbol "AF")
 * The Adaptation Fund, a UN organization responsible for climate change adaptation
 * Adventist Forums, an organization of progressive Seventh-day Adventists
 * Alliance Française, an international organization that aims to promote French language and culture

Elsewhere

 * American Freightways, a U.S. trucking company now operating as FedEx Freight East

Language

 * Académie française, the official institution responsible for overseeing the French language
 * Alliance Française, an international organization that aims to promote French language and culture
 * Acronym Finder, an online database of abbreviations (acronyms, initialisms, etc.)
 * Afrikaans language (ISO 639-1 language code AF)
 * "...as fuck", meaning "very", in SMS language and internet messageboards

Military

 * AF Guardian, a warplane of the US Navy
 * Air force
 * Armed forces

Places

 * Afghanistan, by 2-letter ISO, FIPS 10-4 and obsolete NATO country code
 * .af, the country code top-level domain for Afghanistan
 * Agra Fort railway station, near Rawatpara, Agra, India
 * American Fork, Utah, US

Acoustics and communications

 * Amplify-and-Forward, a scheme of relay channel
 * Alternative frequency
 * Audio frequency

Units of measure

 * Acre-feet, the quantity of water that covers one acre to a depth of one foot
 * Attofarad, an SI unit of electric capacitance

Visual arts

 * Autofocus, the ability of a camera to focus automatically
 * Anisotropic filtering

Other uses in Science and technology

 * Af, the Köppen climate classification for a tropical rainforest climate
 * Across flats (A/F), a measure of hexagonal nut flat size
 * Advanced Format, a new disk format and access using sector sizes larger than 512 bytes
 * Anaerobic filter, a type of anaerobic digester
 * Arcuate fasciculus, a nerve bundle in the brain
 * Atrial fibrillation, a form of cardiac arrhythmia

Other uses

 * Alabama and Florida Railway (reporting mark AF)
 * Anno Fascista, a year in the Italian Fascist calendar