J30 may refer to :
- GSR Class J30, an 1875 Irish class of 0-6-0T steam locomotive
- Honda J30, a 3-liter engine
- Infiniti J30, a 1992 rear wheel drive luxury car
- Westinghouse J30, a predecessor of the 1940 Westinghouse J34 turbojet engine
- J/30, a sailing keelboat designed by J Boats, Inc.
and also :
- Vasomotor and allergic rhinitis ICD-10 code
- J30 index, a Japanese Tokyo Stock Exchange index composed on the larger Japanese industrial companies
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