- jetomic
- jet polishing
- Jet Propulsion Laboratory
- jet pump
- jet quenching
- jet shower
- jet space
- jet spinning
- jet-spun yarn
- jet-stirred reactor
- jet stream
- jet streams
- jet supersonic mixing
- jet terminal shock
- jetting
- jettison
- jet tomography
- jet transfer
- jet transversality theorem
- Jeu de Taquin
- jeu de taquin slide
- jeu de taquin slides
- Jeunesses Musicales International
- JEV
- Jevons