J21 or J-21 may refer to:
Vehicles
Aircraft
- Junkers J 21, a German reconnaissance aircraft
- SAAB J 21, a Swedish fighter
- Shenyang J-21, a Chinese prototype fighter
- Soko J-21 Jastreb, a Yugoslav light attack aircraft
Locomotives
- LNER Class J21, a British steam locomotive class
Ships
- HMCS Canso (J21), a Bangor-class minesweeper of the Royal Navy and Royal Canadian Navy
- HSwMS Södermanland (J21), an Östergötland-class destroyer of the Swedish Navy
- INS Darshak (J21), a survey ship of the Indian Navy
Other uses
- Bronchiolitis
- County Route J21 (California)
- Elongated pentagonal rotunda, a Johnson solid (J21)
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