F31 or F.31 may refer to:
Vehicles
- Aircraft
- Farman F.31, a French prototype fighter aircraft
- Automobiles
- BMW 3 Series (F31), a German estate car
- Nissan Leopard F31, a Japanese sedan
- Ships and boats
- F-31 Sport Cruiser a trimaran sailboat
- HMS Cyclops (F31), a submarine depot ship of the Royal Navy
- HMS Mohawk (F31), a Tribal-class destroyer of the Royal Navy
- INS Brahmaputra (F31), two frigates of the Indian Navy
Other uses
- F31 (classification), a disability sport classification for seated throwing events
- Bipolar affective disorder
- Fluorine-31 (31F), an isotope of fluorine
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