F40, F.40, or F-40 may refer to:
Transportation
Aircraft
- Farman F.40, a French pusher biplane reconnaissance aircraft
- Hirth F-40, a German aircraft engine
- F40, the NATO code for the JP-4 jet fuel
Automobiles
- Beijing F40, a Chinese subcompact pickup truck
- Ferrari F40, an Italian mid-engine sports car
- BMW 1 Series (F40), a German subcompact hatchback
- GM F40 transmission, a car gearbox
Trains
Watercraft
- Brazilian frigate Niterói (F-40), a Niteroi-class frigate of the Brazilian Navy
- HMS Jervis Bay (F40), a British armed merchant cruiser
- HMS Roberts (F40), a Roberts-class monitor of the Royal Navy
- HMS Sirius (F40), a Leander-class frigate of the Royal Navy
- INS Talwar (F40), the lead ship of the Talwar-class frigates of the Indian Navy
Other uses
- F40 (classification), a disability sport classification for athletes of short stature
- F40 (full name F40T12) is a common size fluorescent lamp, at 4 foot or 1.2m
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