J12 may refer to:
Vehicles
editAircraft
edit- Nanchang J-12, a prototype Chinese fighter
Automobiles
edit- Hispano-Suiza J12, a French luxury car
- Subaru J12, a Japanese hatchback
Ships
edit- HSwMS Sundsvall (J12), a Visby-class destroyer of the Swedish Navy
Other uses
edit- Chanel J12, a Swiss-made watch
- County Route J12 (California)
- Triangular bipyramid, a Johnson solid (J12)
- Marlboro Pike Line, a bus route in the Washington Metro Area
- Viral pneumonia