- Jacobs University = Constructor University [Bremen]
- James Cook University
- Japan Agency for Marine-Earth Science and Technology
- Jimma University
- Johannes Gutenberg - Universität Mainz = Johannes Gutenberg University
- John Innes Centre [Norwich]
- Johns Hopkins University
- Johns Hopkins University School of Medicine [Baltimore]
- Joint Research Center, Ispra, Italy
- Joint Research Centre of the European Commission
- José Rizal University
- Josip Juraj Strossmayer University of Osijek
- Jozef Stefan Institute [Ljubljana]
- J-Pal Europe
- Juárez Autonomous University of Tabasco, Nanotechnology Engineering, Multidisciplinary Academic Division of Jalpa de Méndez
- Jules Gonin Eye Hospital
- Julius Kühn-Institut - Federal Research Centre for Cultivated Plants
- Julius-Maximilians-Universität Würzburg = University of Würzburg
- JUNIA
- Justus-Liebig-Universität Gießen = Justus Liebig University