- J. Heyrovský Institute of Physical Chemistry of the ASCR
- J. Paul Getty Museum
- J05 Civil Engineering Building
- JCB-Lyannaj
- JE2358
- JRC Institute for Environment and Sustainability
- JST-ACCEL
- JUNIA
- Jack Baskin School of Engineering
- Jackson School of Geosciences
- Jackson State University
- Jacobs Technology ESCG
- James Cook University
- Jamia Milia Islamia University [New Delhi]
- Jamia Millia Islamia
- Janssen Pharmaceutica [Beerse]
- Japan Aerospace Exploration Agency [Sagamihara]
- Japan Meteorological Agency
- Japanese French Laboratory for Informatics
- Jawaharlal Nehru Centre for Advanced Scientific Research
- Jet Propulsion Laboratory
- Jiujiang University [China]
- Johann-Friedrich Blumenbach Institut für Zoologie und Anthropologie
- Johannes Gutenberg - Universität Mainz = Johannes Gutenberg University
- Johannes Kepler University Linz [Linz]
- Johns Hopkins University
- Johns Hopkins University Applied Physics Laboratory [Laurel, MD]
- Johns Hopkins University School of Medicine Baltimore
- Johns Hopkins University School of Medicine [Baltimore]
- Johnson Matthey
- Johnson Matthey Technology Centre
- Johnson and Johnson Scios
- Join Research Centre
- Joint Centre for Applied Electron Microscopy
- Joint Genome Inst
- Joint Japanese-French Robotics Research Laboratory [Japon]
- Joint Research Division Vascular Biology
- Joseph Louis LAGRANGE
- Josip Juraj Strossmayer University of Osijek
- Journaliste
- Jozef Stefan Institute [Ljubljana]
- Julius-Maximilians-Universität Würzburg
- Julius-von-Sachs-Institut für Biowissenschaften
- Juntendo University Hospital [Tokyo]
- Juriscope - accès aux droits étrangers et promotion du droit français et du droit francophone
- Justus-Liebig-Universität Gießen = Justus Liebig University
- Juárez Autonomous University of Tabasco, Nanotechnology Engineering, Multidisciplinary Academic Division of Jalpa de Méndez