- Jamia Milia Islamia University [New Delhi]
- Janelia Farm Research Campus
- Japan Advanced Institute of Science and Technology
- Japanese French Laboratory for Informatics
- Japan Meteorological Agency
- Japan Science and Technology Agency
- Jefferson (Philadelphia University + Thomas Jefferson University)
- Jet Propulsion Laboratory
- Jewish General Hospital
- Jiangnan Institute of Computing Technology [Chine]
- JiangSu University
- Johannes Gutenberg - Universität Mainz = Johannes Gutenberg University
- Johannes Keppler University
- Johann Radon Institute for Computational and Applied Mathematics
- Johhannes Keppler University
- John Innes Centre [Norwich]
- John Radcliffe Hospital [Oxford University Hospital]
- Johns Hopkins Bloomberg School of Public Health [Baltimore]
- 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 BioEnergy Institute [Emeryville]
- Joint Japanese-French Robotics Research Laboratory [Japon]
- Joint Laboratory for Petascale Computing [Illinois]
- Joint Robotics Laboratory
- Joseph Louis LAGRANGE
- Journaliste
- Jülich Research Centre
- Jülich Supercomputing Centre
- Julius-Maximilians-Universität Würzburg = University of Würzburg
- JUNIA
- Juntendo University Hospital [Tokyo]