- J. A. Baker Institute
- J. Heyrovský Institute of Physical Chemistry
- JC School of Public Health and Primary Care
- JCG Consult
- JDS Uniphase|Cronos, USA
- JDSU Uniphase
- JE359
- JIFRESSE
- JRC Institute for Environment and Sustainability
- JRC Institute for Prospective Technological Studies
- JRC Institute for Reference Materials and Measurements [Geel]
- JRC Institute for Transuranium Elements [Karlsruhe]
- JSR Micro
- James Franck Institute
- Jan and Dan Duncan Neurological Research Institute
- Janelia Farm Research Campus
- Japan Atomic Energy Agency
- Japan Energy Corporation
- Japan Meteorol Agcy, Meteorol Res Inst, Tsukuba, Ibaraki, Japan
- Japan Science and Technology Agency
- Japan Science and Technology Agency, CREST
- Japan Science and Technology Agency, TRIP
- Japanese French Laboratory for Informatics
- Jardin Botanique de Neuchâtel
- Jawaharlal Nehru University
- Jean-Marie Mariotti Center
- Jefferson Medical College
- Jennifer Milligan
- Jeremiah Horrocks Insitute
- Jeremiah Horrocks Institute for Mathematics, Physics and Astronomy [Preston]
- Jet Propulsion Laboratory
- Jeune Equipe JE 2526
- Jodrell Bank Cent. for Astrophysics
- Jodrell Bank Centre for Astrophysics
- Jodrell Bank Observatory
- Johann Radon Institute for Computational and Applied Mathematics
- Johann Wolfgang Goethe University Medical Center
- Johann-Friedrich Blumenbach Institut für Zoologie und Anthropologie
- John P. Hussman Institute for Human Genomics
- Joint ALMA Observatory
- Joint Center for Earth Systems Technology [Baltimore]
- Joint Centre for Applied Electron Microscopy
- Joint Genome Institute
- Joint Genome institute
- Joint Global Change Research Institute
- Joint Institute for High Temperatures of the RAS
- Joint Institute for Laboratory Astrophysics
- Joint Institute for the Study of the Atmosphere and Ocean
- Joint Institute for the Study of the Atmosphere and Oceans
- Joint International Unit for Water, Environment and Public Policy
- Joint Malaria Programme
- Joint Program on the Science and Policy of Global Change
- Joint Research Centre
- Joint Research Centre - Institute for Health and Consumer Protection
- Joint Technology Center,
- Jomo Kenyatta Univ Agr & Technol
- Jonsson Comprehensive Cancer Center at UCLA
- Jordan Seismological Observatory
- Jose Carreras Research Institute
- Joseph Louis LAGRANGE
- Joslin Diabetes Center, Department of Medicine
- Journaliste
- Juelich Centre for Neutron Science
- Jules Gonin Eye Hospital
- Jules Stein Eye Institute University of California at Los Angeles
- Julius Center for Health Sciences and Primary Care
- Julius Center for Health Sciences and Primary Care [Utrecht, The Netherlands]
- Julius Centre for Health Sciences and Primary Health Care
- Julius Maximilians University Wurzburg
- Julius-von-Sachs-Institut für Biowissenschaften
- Julius-von-Sachs-Institute - Department of Molecular Plant Physiology and Biophysics
- Juntendo University School of Medicine
- Jülich Supercomputing Centre