J40 may refer to:
- County Route J40 (California)
- Elongated pentagonal orthocupolarotunda, a Johnson solid (J40)
- HMS Fermoy (J40), a Hunt-class minesweeper of the Royal Navy
- Toyota Land Cruiser (J40), a Japanese off-road vehicle
- Westinghouse J40, an American turbojet engine
This disambiguation page lists articles associated with the title J40.
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