| J2EE | Java 2 Platform, Enterprise Edition |
| J2ME | Java 2 Micro Edition |
| JAABE | Journal of Asian Architecture & Building Engineering |
| JAD | Joint Application Development |
| JAD | Jamaah Ansharut Daulah |
| JAD | Java Application Descriptor |
| JAD | Journal of Adhesive Dentistry |
| JAD | Journal of Affective Disorders |
| JAFZA | Jebel Ali Free Zone Authority |
| JAIIB | Junior Associate of Indian Institute of Bankers |
| JAIST | Japan Advanced Institute of Science and Technology |
| JAL | Japan Airlines |
| JAL | Jalisco |
| JAL | El Lencero Airport |
| JAL | Jalapa |
| JAL | Junior Achievement Latvia |
| JAL | Jefatura de Apoyo Logistico |
| JAL | Journal of Academic Librarianship |
| JAL | Journal des Annonces Légales |
| JAL | Just Another Language |
| Jan | January |
| JAN | Job Accommodation Network |
| JAN | Japanese Article Number |
| JAN | Jackson–Medgar Wiley Evers International Airport |
| JAR | Java ARchive |
| JAR | Joint Aviation Requirements |
| JAROS | Japan Resources Observation System Organization |
| JARVIS | Just A Rather Very Intelligent System |
| JASMINE | Japan Astrometry Satellite Mission for INfrared Exploration |
| JAVA | from Java coffee, said to be consumed in large quantities by the language’s creators |
| JAXA | Japan Aerospace Exploration Agency |
| JBET | Java Binary Enhancement Tool |
| JBL | James Bullough Lansing |
| JBL | Japan Basketball League |
| JBL | Journal of Biblical Literature |
| JCB | Josephy Cyril Bamford |
| JCB | Japan Credit Bureau |
| JCB | Journal of Cell Biology |
| JCB | Joint Centre for Bioethics |
| JCB | Journal of Crustacean Biology |
| JCB | Santa Terezinha Municipal Airport |
| JCI | Joint Commission International |
| JCI | Junior Chamber International |
| JCI | New Century AirCenter |
| JCI | Jarvis Collegiate Institute |
| JCIA | Joint Commision International for Accreditation |
| JCP | James Cash Penney (J. C. Penney) |
| JCP | Journal of Chemical Physics |
| JCP | Java Community Process |
| JCP | Journal of Clinical Pathology |
| JCP | Japanese Communist Party |
| JCP | Juventude Comunista Portuguesa |
| JCP | Jim Crockett Promotions |
| JCP | JobCentre Plus |
| JCP | Joint Combat Pistol |
| JCP | Journal of Consumer Psychology |
| JCP | Judicial Corporal Punishment |
| JCP | Justice and Construction Party |
| JCP | Jenny Craig Pavilion |
| JCP | Journal of Computational Physics |
| JD | Julian Date/Day |
| JD | Juris Doctor |
| JD | John Deere |
| JD | Job Description |
| JD | JingDong |
| JD | Jack Danie’s |
| JD | Java Decompiler |
| JD | Jordanian Dinar |
| JD | Juvenile Delinquency |
| JD | JustDial |
| JD | Jade Dynasty |
| JD | Just Dance |
| JD | जनता दल |
| JD | John & David |
| JD(U) | Janata Dal (United) |
| JDBC | Java Database Connectivity |
| JDC | Japanese Digital Cellular |
| JDC | American Jewish Joint Distribution Committee |
| JDC | Juvenile Detention Center |
| JDE | Java Development Environment |
| JDE | Jacobs Douwe Egberts |
| JDE | JD Edwards |
| JDE | Journal of Development Economics |
| JDI | Just Do It |
| JDI | Japan Display Inc. |
| JDI | Java Debug Interface |
| JDI | Job’s Daughters International |
| JDI | Just Detention International |
| JDK | Java Development Kit |
| JDK | Just Don’t Know |
| JEDEC | Joint Electron Device Engineering Council |
| JEE | Joint Entrance Examination |
| JET | Joint Engine Technology |
| JET | Journal of Economic Theory |
| JET | Japan Exchange and Teaching |
| JET | Journalists Environmental association of Tanzania |
| JET | Joint European Torus |
| JET | Joint Entrance Test |
| JFC | Java Foundation Classes |
| JFC | Allied Joint Force Command |
| JFC | Jollibee Foods Corporation |
| JFC | Jupiter-Family Comet |
| JFC | James Fenimore Cooper |
| JFC | John from Cincinnati |
| JFC | Juventus Football Club |
| JFC | Jean-François Copé |
| JFC | Japan Food Corporation |
| JFC | Jeffries Fan Club |
| JFET | Junction Field Effect Transistor |
| JFK | John Fitzgerald Kennedy |
| JFK | John F. Kennedy International Airport |
| JIPMER | Jawaharlal Institute of Postgraduate Medical Education & Research |
| JIRA | truncation of Gojira, the Japanese name for Godzilla |
| JIRA | Japan Industries Association of Radiological Systems |
| JIRA | Japan Investor relations Association |
| JIRA | Japan Industrial Robot Association |
| JIRA | Journal of Indian Rheumatology Association |
| JIRA | Journal of Iranian Research and Analysis |
| JITO | Just-in-Time Oscillator |
| JITO | Jain International Trade Organisation |
| JITO | Joinery Industry Training Organisation |
| JK | Just Kidding |
| JK Tyre | named after its founders, Juggilal Singhania & Kamlapat Singhania |
| JKD | Jeet Kune Do |
| JKNC | Jammu & Kashmir National Conference |
| JMET | Joint Management Entrance Test |
| JMI | Java Metadata Interface |
| JMI | Japan Market Intelligence |
| JMI | Jamia Millia Islamia |
| JMS | Java Message Service |
| JMS | Journal of Mass Spectrometry |
| JMS | Journal of Management Studies |
| JMS | Joseph Michael Straczynski |
| JMS | Journal of Materials Science |
| JMS | John Maynard Smith |
| JMS | Johannesburg Muslim School |
| JMS | John Mason School |
| JNLP | Java Network Launching Protocol |
| JNNURM | Jawaharlal Nehru National Urban Renewal Mission |
| JNTU | Jawaharlal Nehru Technological University |
| JNU | Jawaharlal Nehru University |
| JNU | Jinan University |
| JNU | Juneau International Airport |
| JoSAA | Joint Seat Allocation Authority |
| JOSAA | Journal of the Optical Society of America A |
| JPC | Joint Parliamentary Committee |
| JPC | Journal of Physical Chemistry |
| JPC | John Paul College |
| JPEG | Joint Photographic Experts Group |
| JPG | Joint Photographic Experts Group (JPEG) |
| JPL | Jet Propulsion Laboratory |
| JPS | Japan Professional Photographers Society |
| JPS | Jewish Publication Society |
| JPS | John Peter Smith |
| JPS | Juvenile Polyposis Syndrome |
| JPY | Japanese Yen |
| Jr | Junior |
| JR | Japan Railways |
| JR | Joy Air |
| JR | James Ross |
| JR | Aero California |
| JRS | Jesuit Refugee Service |
| JRS | Atarot Airport |
| JRS | Judges Retirement System |
| JRS | John Ruskin School |
| JRTO | Joint Regional Transport Officer |
| JRY | Jawahar Rojgar Yojna |
| JSON | JavaScript Object Notation |
| JSP | JavaServer Pages |
| JSP | Jana Sena Party |
| JSP | Japan Socialist Party |
| JSP | Jack Straw Productions |
| JSP | Jeju Airport |
| JSP | Jackson Structured Programming |
| JSW | Jindal South West |
| JSW | Japan Steel Works |
| JSW | Jastrzębska Spółka Węglowa |
| JSW | Jet Set Willy |
| JSW | Journal of Social Work |
| JSW | Journal of the Southwest |
| JSW | Japanische Schule in Wien |
| JSY | Syros Island National Airport |
| JSY | जननी सुरक्षा योजना |
| JTA | Java Transaction API |
| JTA | Japan Transocean Air |
| JTA | Jacksonville Transportation Authority |
| JTA | Japan Tourism Agency |
| JTA | Jewish Telegraphic Agency |
| JTA | Junior Technical Assistant |
| JTA | Japan Tennis Association |
| JTAPI | Java Telephony API |
| JTARV | Joint Tactical Aerial Resupply Vehicle |
| JTP | Jayem Tata Performance |
| JTP | Journal of Transpersonal Psychology |
| JTP | Journal of Theoretical Politics |
| JTP | Justin Thomas Pawlak |
| JUIT | Jaypee University of Information Technology |
| Jul | July |
| JUL | Juliaca Airport |
| JUL | Jugoslovenska Levica |
| Jun | June |
| JUN | Jundah Airport |
| JVC | Japan Victor Company |
| JVC | Jesuit Volunteer Corps |
| JVM | Java Virtual Machine |
| JvM | Jung von Matt |
| JVM | Jharkhand Vikas Morcha |
| JVM | Journal of Vacation Marketing |
| JVVNL | Jaipur Vidyut Vitran Nigam Limited |
| Jyothy Laboratories | named after its founder’s daughter, Jyothy |
