J1
- 1J (disambiguation)
- AEG J.I
- ATC code J01
- Al Fahd 300
- Albatros J.I
- Bessel function
- HMS J1
- Haplogroup J1 (Y-DNA)
- J-1 World Heavyweight Championship
- J-1 visa
- J-I rocket
- J.I the Prince of N.Y
- J1 (song)
- J1 League
- J1 Live Concert
- J1 World Tour
- J1 type submarine
- JAC J1
- Janko group J1
- Joint Chiefs of Staff
- Junkers J 1
- Junkers J.I
- LNER Class J1
- Lawrance J-1
- PRR J1
- S/2003 J 1
- Samsung Galaxy J1