| JASON | Ocean surface Topography follow-on mission to TOPEX/POSEIDON (CNES/NASA) |
| JAXA | Japan Aeronautic Exploration Agency (name change of NASDA) |
| JCOMM | Joint WMO/IOC Technical Commission for Oceanography and Marine Meteorology |
| JCSDA | Joint Centre for Satellite Data Assimilation (USA) |
| JMA | Japan Meteorological Agency |
| JRA-25 | “Japanese Re-Analysis 25 years” JMA research project of long-range re-analysis of global atmosphere |
| JSC | Joint Scientific Committee (WCRP) |
- China Meteorological Administration
- China National Space Administration
- Centre National d'Etudes Spatiales
- The European Space Agency
- EUMETSAT
- India Meteorological Department
- Intergovernamental Oceanographic Commission of UNESCO
- Indian Space Research Organisation
- Japan Aerospace Exploration Agency
- Japan Meteorolocical Agency
- Korea Meteorological Administration
- National Aeronautics and Space Administration
- U.S. National Oceanic and Atmospheric Administration
- Federal Space Agency
- Russian Federal Service for Hydrometeorology and Environmental Monitoring
- World Meteorological Organization