| JAEL | JSC Avionics Engineering Laboratory | - | Atmospheric Research Center |
| JCMT | James Clerk Maxwell Telescope | - | Atmospheric Research Center |
| JD | Julian Date; Julian Day (Number) | - | Atmospheric Research Center |
| JEM | Japanese Experiment Module | - | Atmospheric Research Center |
| JERS | Japanese Earth Resources Satellite | - | Atmospheric Research Center |
| JGR | Journal Of Geophysical Research | - | Atmospheric Research Center |
| JILA | Joint Institute For Laboratory Astrophysics | - | Atmospheric Research Center |
| JPL | Jet Propulsion Laboratory | - | Atmospheric Research Center |
| JSC | Johnson Space Center | - | Atmospheric Research Center |
