FD

• Canon FD lens mount, a standard for connecting a lens to a camera
• Familial dysautonomia, a disorder of the autonomic nervous system
• Fermi–Dirac statistics (F–D statistics), in quantum statistics
• Ferredoxin, iron–sulfur proteins
• File descriptor, in Unix and related computer operating systems
• Freedesktop.org (fd.o), an interoperability project
• Functional dependency, a constraint in a relation from a database
• Nissan FD engine, for trucks and buses

• Thai AirAsia, IATA airline code FD
• Mazda RX-7 (FD), a car
• FD Phantom, original name for the FH Phantom jet fighter
• Russian locomotive class FD
• Flight director (aeronautics), a flight instrument
• Flying Dutchman (dinghy)

• Formula Drift, an American motorsport series
• Fidei defensor (Latin, 'Defender of the Faith'), part of the full style of many English/British monarchs
• Fixed deposit, a financial instrument
• Finance Director, or chief financial officer, in a company
• Fire Department, providing firefighting services
• Force of the Right (Forța Dreptei), a Romanian political party
• Financial Dynamics, a UK business services and lobbying firm acquired by FTI Consulting in 2006

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• Floppy disk drive (FDD) in early computers

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