J30 may refer to:
Vehicles
- Automobiles
- Honda J30, an automobile engine
- Infiniti J30, a Japanese luxury car
- Nissan J30, a Japanese sedan
- Toyota Land Cruiser (J30), a Japanese off-road vehicle
- Boats
- J/30, keelboat
- Locomotives
- GSR Class J30, an Irish steam locomotive
Other uses
- Pentagonal orthobicupola, a Johnson solid (J30)
- Rhinitis
- Westinghouse J30, a turbojet engine
- J30 index, a stock index tracking the Tokyo Stock Exchange
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