| Abbreviation | Definition |
|---|---|
| JRP | John Robert Powers |
| JRS | Jeffrey Ryan Smoots |
| JS | Jennifer Shen |
| JS | Jimmy Stewart |
| JS | Johann Sebastian |
| JS | John Scott |
| JS | Jon Spencer |
| JS | Justice Strauss |
| JSB | Johann Sebastian Bach |
| JT | Jeremiah Thomas |
| JT | John Taylor, rock musician |
| JT | Justin Timberlake |
| JTB | John The Baptist |
| JTH | Jordan Taylor Hanson |
| JTK | James Tiberius Kirk |
| JTR | John The Revelator, musician |
| JTT | Jonathan Taylor Thomas |
| JTW | Jonathon T. Wizard |
| JV | Jose Velarde |
| JVA | John Vincent Atanasoff, Inventor of the Modern Electronic Computer |