JT may stand for:
- JT (album), by James Taylor
- JT (visualization format), a 3D data format
- J. T. the Brick, the stage name of radio host John Tournour
- JT the Bigga Figga, a hip-hop artist and producer
- Haplogroup JT (mtDNA), a human mitochondrial DNA haplogroup
- Jakobstads Tidning, a Finland-Swedish newspaper
- Japan Tobacco, a cigarette manufacturer
- Jersey Telecom, the Jersey telephone company
- John Terry, English footballer who is Chelsea and England captain.
- Junior Technician, an airman rank
- Jennifer Tilly, an actress
- Justin Timberlake, singer
- John Tavares, ice hockey player.
- Johnathan Thurston, rugby league footballer.
- Jamie T, a British indie-rock singer
- J.T. Yorke, Degrassi: The Next Generation character
- The IATA airline designator for Lion Air
- Jerry Trainor, an actor best known for his roles in iCarly and Drake and Josh
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