J34 may refer to:
- Hawker J 34 Hunter, a British fighter jet in service with the Swedish Air Force
- LNER Class J34, a British steam locomotive class
- Malaysia Federal Route J34
- Pentagonal orthobirotunda (J34), a Johnson solid
- Westinghouse J34, an American turbojet engine
This disambiguation page lists articles associated with the same title formed as a letter–number combination.
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