- JAGIELLONIAN UNIVERSITY KRAKOW POL
- Jagrellonian University
- Japan Energy Corporation
- Japan Institute for Labor Policy and Training
- Japan Society for the Promotion of Science
- Jena University
- Jet Propulsion Laboratory
- J. Mack Robinson College of Business
- Johann Heinrich von Thünen-Institut, Institut für Agrarrelevante Klimaforschung
- Johann Radon Institute for Computational and Applied Mathematics
- John F. Kennedy School of Government
- Joint Global Change Research Institute
- Joint International Unit for Water, Environment and Public Policy
- Joint Research center
- Joint Research Centre
- Joint Transport Research Centre of the OECD and the International Transport Forum
- Jönköping University
- Joseph Louis LAGRANGE
- Journaliste
- Joysonic
- JRC Institute for Energy and Transport
- JRC Institute for Environment and Sustainability
- JRC Institute for Prospective Technological Studies
- JRC Institute for the Protection and Security of the Citizen [Ispra]
- JRC Institute for Transuranium Elements [Karlsruhe]
- Judge Business School
- Juriscope - Accès aux droits étrangers et promotion du droit français et du droit francophone [UMS 2268]