| Acronym | Meaning |
 | IWGGCDM | International Working Group On Global Change And Data Management |
| IWGMFS | International Working Group On Magnetic Field Satellites |
| IWRA | International Water Resources Association |
| IWRS | Improved Weather Reconnaissance System |
| JAFNA | Joint Air Force NASA Facility |
| JAROS | Japan Resources Observation System Organization |
| JAS | Journal Of The Atmospheric Sciences |
| JASIN | Joint Air-Sea Interaction Experiment |
| JASON | Group Of Physicists At Stanford That Study Various Projects And Are Funded By Government Defense Money |
| JAWOP | Joint Automated Weather Observing Program |
| JAWS | Joint Airport Weather Studies |
| JCAE | Joint Committee On Atomic Energy |
| JCL | Job Control Language |
| JCP/ PO | Joint Climate Program/Projects Office |
| JCS | Joint Chiefs Of Staff |
| JEC | Joint-Evaluation Committee |
| JEFNIC | Jeffco Network Infrastructure Completion Project |
| JEM | Joint Environmental Monitoring |
| JERS | Japan Earth Remote Sensing Satellite |
| JERS-1 | Japanese Earth Resources Sensing Satellite 1 |
| JES | Job Entry System |
| JETDLAG | Part Of EUROTRAC |
| JFSP | Joint Forecast System Project |
| JGOFS | Joint Global Ocean Flux Study |
| JGR | Journal Of Geophysical Research |
| JHU | Johns Hopkins University |
| JHWRP | Joint Hawaii Warm Rain Project |
| JIC | Joint Implementation Committee |
| JICA | Japan International Development Agency |
| JICC | Japanese ICC |
| JICP/PO | Now JOSS |
| JILA | Joint Institute For Laboratory Astrophysics |
| JMA | Japan Meteorological Agency |
| JMG | Joint Meteorological Group |
| JMOF | Joint Meteorological Observing Facility |
| JMRNSC | Joint Meteorological Rocket Network Steering Committee |
| JMSC | Joint Meteorological Satellite Communication |
| JOC | Joint Organizing Committee |
| JODC | Japan Ocean Data Center |
| JOI | Joint Oceanographic Institutions |
| JONSWAP | Joint North Sea Wave Project |
| JOSS | Joint Office For Science Support |
| JPL | Jet Propulsion Laboratory |
| JPOP | Japanese Polar Orbiting Platform |
| JPS | Joint Planning Staff |
| JSC | Johnson Space Center |
| JSC | Joint Scientific Committee |
| JSPO | Joint Systems Program Office |
| JTA | Job Table Area |
| JVNC | John Von Neumann National Supercomputing Center |
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