Fag or FAG may refer to:
- Cigarette, in British and Australian slang
- Fagging, hierarchical servitude in British public schools
- Faggot, a pejorative term for a homosexual
- FAG, a brand of the Schaeffler Group
- FAGS (candy), now FADS, an Australian candy
- Fagurhólsmýri Airport, in Iceland by IATA code
- Federação Anarquista Gaúcha, a Brazilian anarchist organization
- Feminist Art Gallery, in Toronto, Ontario, Canada
- Finongan language, spoken in Papua New Guinea (ISO 639 code)
- Fluorescein angiography
- Frisch Auf Göppingen, a German sport club
- Fuerzas Armadas Guanches, a terrorist group in the Canary Islands
- Guatemalan Air Force (Spanish: Fuerza Aérea Guatemalteca)