| Abbreviation | Definition |
|---|---|
| J.L.A. | Junior Laboratory Assistant |
| J.P | Justice of the Peace |
| JA | Jump if Above |
| JA | Japanese Agricultural |
| JAA | Jump Almost Always |
| JAAC | Jharkhand Area Autonomous Council |
| JAAPA | Junior Award For Initiative And Leadership |
| JAC | Jackson Arthritis Center |
| JACD | Joint Architectural Control Document |
| JACG | Joint Asian Crime Group |
| JAD | Joint Assembly Demonstration |
| JAD | Joint Application Design |
| JAE | Jump If Above or Equal |
| JAE | Junior Account Executive |
| JAEIC | Joint Atomic Energy Intelligence Committee |
| JAEL | JSC Avionics Engineering Laboratory |
| JAG | Judge Adjutant General |
| JAG | Jobs For Arizona Graduates |
| JAG | Judge Advocate General |
| JAG | Jihad Advocate General |
| JAG | Junior Administrative Grade |
| JAIL | Judges Award Of Merit |
| JAIN | Joint American Indian Network |
| JAK | Janus Activated Kinase |
| JAL | Japan Airlines |
| JAL | Jump And Link |
| JAM | Jump And Move |
| JAM | Just Another Messenger |
| JAM | Junior Faculty Research Award |
| JAMA | Journal of the American Medical Association |
| JAMES | Joining Across Miles Environmental Systems |
| JAMS | Job Access & Management System |
| JAN | Job Accommodation Network |
| JANUS | Joint Agricultural Navigation Using Satellites |
| JAQ | Job Analysis Questionnaire |
| JAS | Joint Activation System |
| JAS | Japan Amateur Satellite |
| JAS | Japanese Agricultural Standards |
| JASAE | Juvenile Automated Substance Abuse Evaluation |
| JASES | Journal of Applied Sciences in Environmental Sanitation |
| JAWS | Just Another Working Stiff |
| JAZA | Japanese Association of Zoos and Aquaria |
| JB | Jump if Below |
| JBB | Joint Branch Board |
| JBE | Jump If Below or Equal |
| JBJS | Journal Of Bone And Joint Surgery |
| JBOSC | Joint Base Operations and Support Contract |
| JBP | Jettison Booster Package |
| JBS | Jump and Blow Stack |
| JBT | Junior Basic Training |