- Jan and Dan Duncan Neurological Research Institute
- JANE GOODALL INSTITUTE
- Japan Nuclear Cycle Development Institute
- Jet Propulsion Laboratory
- Jiangxi Academy of Sciences
- Johann Heinrich von Thünen Institute
- Joint Center for Earth Systems Technology [Baltimore]
- Joint Global Change Research Institute
- Joint Nature Conservation Committee (UK)
- Joint Research Centre
- Jordan University of Sciences and Technology
- Joseph Louis LAGRANGE
- Journaliste
- JRC Institute for Energy and Transport
- JRC Institute for Environment and Sustainability
- JRC Institute for Reference Materials and Measurements [Geel]
- JRC Institute for Transuranium Elements [Karlsruhe]
- Julius Wolff Institute and Center for Musculoskeletal Surgery
- Jurusan Teknik Arsitektur