A fast Fourier transform is a numerical algorithm used in signal processing.

FFT may also refer to:

• Final Fantasy Tactics, a video game
• A Fistful of TOWs, a miniatures wargame
• Fédération Française de Tarot, the French tarot federation

• Fédération Française de Tennis, the French Tennis Federation
• Firefighters Upsala CK, a Swedish cycling team
• Football Federation Tasmania, a football organisation in Australia
• Four Four Two (4-4-2), a football formation
  • FourFourTwo, a football magazine
  • FourFourTwo (TV series), an Asian football TV series
  • 4-4-2, a band formed to record the song "Come on England" for the England football team for the Euro 2004 championship
• Tajikistan Football Federation (Tajik: Federosijuni futʙoli Toçikiston)

• 2,1-fructan:2,1-fructan 1-fructosyltransferase
• Faculty of Food Technology, Latvia University of Agriculture
• Final-Form Text, part of IBM's Document Control Architecture
• Future Fibre Technologies, an Australian fibre optic company
• Faecal (or fecal) flotation test, a method used in veterinary parasitology to detect helminth eggs in faecal samples

• Frontier Airlines
• Capital City Airport (Kentucky)

• Finite Fourier transform (disambiguation)