| Abbreviation | Definition |
|---|---|
| JNPA | Japan National Police Agency |
| JOC | Joint Operations Center |
| JOCC | Joint Operations Control Center |
| JOPI | Joint OPerational Instructions |
| JP | Japan Police |
| JP | The Japanese Police |
| JPD | Jonesboro Police Department |
| JPEP | Junior Police Explorers Program |
| JPM | Joint Performance Monitoring |
| JPSO | Jefferson Parish Sheriff's Office |
| JPTC | Joint Police Training Center |
| JPTC | Joint Police Training Centre |
| JRCC | Joint Regional Communications Centre (CARICOM) |
| JTB | Justified True Belief |
| JTR | Jack The Ripper |
| JTTF | Joint Terrorism Task Force |
| JUG | Juvies Under Guard |
| JUSTUS | Justice Uses Situations To Understand Success |
| K | Knife |
| K.I.C.K.S. | Kids Involving Cops for Knowledge and Sport |