| Abbreviation | Definition |
|---|---|
| JES | Japan/ East Sea |
| JESSE | Journal for Earth System Science Education |
| JFA | Japan Fisheries Agency |
| JFSP | Joint Forecast System Project |
| JGOFS | Joint Global Ocean Flux Study |
| JIC | Joint Ice Center |
| JIMAR | Joint Institute for Marine and Atmospheric Research |
| JISAO | Joint Institute for the Study of the Atmosphere and Ocean |
| JKFC | Japan-Republic of Korea Joint Fisheries Commission |
| JMA | Japan Meteorological Agency |
| JMSA | Japan Marine Safety Agency |
| JMST | Journal of Marine Science and Technology |
| JOA | Joint Oceanographic Assembly |
| JOC | Japanese Ocean Cyclone |
| JOC | Joint Organizing Committee |
| JODC | Japan Oceanographic Data Center |
| JOI | Joint Oceanographic Institutions, Inc. |
| JOIDES | JODC On-line Information and Data Exchange Service |
| JOIDES | Joint Oceanographic Institutions for Deep Earth Sampling |
| JONSDAP | Joint North Sea Data Acquisition Project |