| Abbreviation | Definition |
|---|---|
| JCST | Jackson County Swim Team |
| JCW | Juggalo Championship Wrestling |
| JCW | Just Cause Wrestling |
| JCZ | Jody's Cheer Zone |
| JD | Jersey Devil |
| JD | Junior Division |
| JDC | John Deere Classic |
| JDC | Junior Duelist Challenge |
| JES | Jack Evans Score |
| JETS | Just End The Season |
| JFA | Jamaica Fitness Association |
| JFDB | Japan Football Data Bank |
| JFF | Jamaica Football Federation |
| JFL | Japan Football League |
| JFL | Junior Football League |
| JFRA | Jamaica Football Referees Association |
| JFRR | Jefferson City Road Runners |
| JFRT | Jack Frost/Big Boulder Race Track |
| JFRT | Jesus Fish Racing Team |
| JG | Joe Gibbs |