- Jacobs University = Constructor University [Bremen]
- James Cook University
- Jan Dlugosz University in Czestochowa
- Janssen BioPharma
- Janssen Cilag
- Janssen-Cilag [Issy-les-Moulineaux]
- Janssen Infectious Diseases Discovery
- Janssen Pharmaceutica [Beerse]
- Janssen Pharmaceutica N.V. [Beerse, Belgium]
- Janssen Research & Development
- Japan Aerospace Exploration Agency [Sagamihara]
- Japan Aerospace Exploration Agency [Tokyo]
- Japan Agency for Marine-Earth Science and Technology
- Japan Agency for Medical Research and Development
- Japan Atomic Energy Agency
- Japan Atomic Energy Agency [Ibaraki]
- Japanese Society for the Promotion of Science Fellow
- Japan International Research Center for Agricultural Sciences
- Jardin des Sciences, Université de Strasbourg
- Jawaharlal Nehru Centre for Advanced Scientific Research
- Jazan University [Jazan, Saudi Arabia]
- J. Craig Venter Institute
- Jena University Hospital [Jena]
- Jesus Uson Minimally Invasive Surgery Centre Foundation
- JEUMONT Electric
- Jiangsu Center for Collaborative Innovation in Geographic Information Resource Development and Application, Nanjing, Jiangsu 210023, China
- Jiangsu Normal University
- Jiangxi Agricultural University
- Jiangxi University of Science and Technology
- Jilin Jianzhu University
- Jilin University
- Jinan University [Guangzhou]
- Johannes Gutenberg - Universität Mainz = Johannes Gutenberg University
- John’s Hopkins Berman Institute of Bioethics
- Johns Hopkins University
- Johns Hopkins University Applied Physics Laboratory [Laurel, MD]
- Johns Hopkins University School of Medicine
- Johns Hopkins University School of Medicine [Baltimore]
- Joint Research Unit CTFC – AGROTECNIO, Solsona, Spain
- Jomo Kenyatta University of Agriculture and Technology
- Josip Juraj Strossmayer University of Osijek
- Jozef Stefan Institute [Ljubljana]
- JTEKT
- Jülich Centre for Neutron Science
- Julius Kühn-Institute
- Julius-Maximilians-Universität Würzburg
- JUNIA
- Juntendo University
- Juntendo University School of Medicine
- Justus-Liebig-Universität Gießen = Justus Liebig University
- J.W. Goethe Universität, Institut für Geowissenschaften, Altenhöferallee 1, D-60438 Frankfurt am Main, Germany