AF, af, Af, etc. may refer to:
Arts and entertainment
- A-F Records, Pittsburgh, Pennsylvania
- Almost Family, US TV series
Businesses and organizations
European
- ÅF, a Swedish technical consulting company
- AF Gruppen, a construction company, Norway
- Action Française, a French political movement
- Air France, IATA code and stock symbol
- Anarchist Federation (British Isles)
International
- Abercrombie & Fitch, A&F, US clothing shops
- The Adaptation Fund, for climate change adaptation, UN
- Adventist Forums, of Seventh-day Adventists
Elsewhere
- American Freightways, US trucking company, merged into FedEx Freight
Language
- Académie française, for French language matters
- Alliance Française, promoting French language and culture
- Acronym Finder, an online database
- Afrikaans language (ISO 639-1 language code AF)
- "...as fuck", meaning "very", in SMS language
Medicine
- Amniotic fluid
- Atrial fibrillation, an abnormal heart rhythm
Military
- AF Guardian, a US Navy warplane
- Air force
- Armed forces
- A US Navy hull classification symbol: Provisions store ship (AF)
Names
- Af, a Swedish nobiliary particle used in surnames
Places
- Afghanistan, by 2-letter ISO, FIPS 10-4, LOC MARC and obsolete NATO country code
- .af, the top-level Internet domain for Afghanistan
- Agra Fort railway station, Rawatpara, India
Politics
- America First with Nicholas J. Fuentes, a political commentary show hosted by Nick Fuentes that started in 2017
Science and technology
Acoustics and communications
- Amplify-and-Forward, a scheme of relay channel
- Alternative frequency
- Audio frequency
Units of measure
Visual arts
- Autofocus, of a camera
- 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, large hard disk sectors
- Anaerobic filter, a type of anaerobic digester
- Arcuate fasciculus, a nerve bundle in the brain
Other uses
- Alabama and Florida Railway (reporting mark AF)
- Anno Fascista, a year in the Italian Fascist calendar