| Abbreviation | Definition |
|---|---|
| JNCI | Journal of the National Cancer Institute |
| JNI | Jansen Newman Institute |
| JNI | Jansen Newman Institute's |
| JNVS | Jawahar Navodaya Vidyalaya Samiti |
| JOI | Jacksonville Orthopaedic Institute |
| JOI | Joint Oceanographic Institution |
| JOI | Joint Oceanographic Institutions |
| JOIDES | Joint Oceanographic Institute For Deep Earth Sampling |
| JOIDES | Joint Oceanographic Institution Deep Earth Sampling |
| JPI | Japan Petroleum Institute |
| JPI | Jewish Professional Institute |
| JPI | Jewish Professionals Institute |
| JPI | Jinnah Polytechnic Institute |
| JPI | Josephine Porter Institute |
| JPI | Justice Policy Institute |
| JPII | John Paul II Institute |
| JPIP | Jawa Pos Institute of Pro |
| JPNI | Justin Parker Neurological Institute |
| JPPI | Jewish People Policy Institute |
| JPSR | Job Performance Statement Reference |