| Acronym | Meaning |
 | JH | Japan Highway Public Corporation |
| JI | Joint Implementation |
| JIB | Joint Information Bureau |
| JIC | Joint Intelligence Centre |
| JINI | Java Intelligent Network Infrastructure |
| JITC | Joint Interoperability Test Command |
| JIVE | Joint Institute For VLBI (Very Long Baseline Interferometry) In Europe |
| JK | Jedi Knight - Just Kidding -Spanair (IATA Airline Designator) |
| JL | Japan Airlines (IATA Airline Designator) |
| JLA | Justice League Of America |
| JM | Jamaica (FIPS 10-4 Country Code; ISO 3166 Digram) |
| JMD | Jamaican Dollar (ISO 4217 Currency Code) |
| JMS | Java Message Service |
| JN | Jan Mayen Island (FIPS 10-4 Territory Code) |
| JNI | Java Native Interface |
| JNLP | Java Network Launch Protocol |
| JO | Jordan (FIPS 10-4 Country Code; ISO 3166 Digram) |
| JOA | Joint Operations Area |
| JOD | Jordanian Dinar (ISO 4217 Currency Code) |
| JOPES | Joint Operations Planning And Execution System |
| JOR | Jordan (ISO 3166 Trigram) |
| JOTS | Joint Operations Tactical System |
| JP | Japan (ISO 3166 Digram) -Justice Of The Peace |
| JPEG | Joint Photographic Experts Group (djay-peg) |
| JPL | Jet Propulsion Laboratory |
| JPN | Japan (ISO 3166 Trigram) |
| JPN | Japanese Language (ISO 639-2 Code) |
| JPOW | Joint Project Optic Windmill |
| JPY | Japanese Yen (ISO 4217 Currency Code) |
| JQ | Jetstar Airways (IATA Airline Designator) -Johnny Quick -Johnston Atoll (FIPS 10-4 Territory Code) -Jonny Quest - Joshua Quagmire |
| JRA | Japanese Red Army - Joint Rear Area |
| JRDF | Joint Rapid Deployment Forces |
| JRE | Java Runtime Environment |
| JREF | James Randi Educational Foundation |
| JROC | Joint Requirements Oversight Council |
| JROCM | JROC Memorandum |
| JRRF | Joint Rapid Reaction Forces |
| JSAF | Joint Semi-Automated Forces (jay-saff) |
| JSCSC | Joint Services Command And Staff College |
| JSD | Juris Scientiae Doctor (Latin |
| JSEAD | Joint Suppression Of Enemy Air Defence (see SEAD) |
| JSF | Joint Strike Fighter |
| JSIMS | Joint Simulation System |
| JSOA | Joint Special Operations Area |
| JSOTF | Joint Special Operations Task Force |
| JSP | Joint Services Publication |
| JSP | JavaServer Page |
| JSR | Java Specification Request |
| JSS | Joint Support Ship |
| JSTARS | Joint Surveillance Target Attack Radar System (djay-starz) |
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