- JEUMONT ELETRIC
- JRC Institute for Transuranium Elements [Karlsruhe]
- JST-Crest
- Japan Science and Technology Agency
- Japanese French Laboratory for Informatics
- Jet Propulsion Laboratory
- Jeumont Electric, Altawest
- Jeune Equipe Hémopathogènes Vectorisés
- Jeunes Équipes de l'Institut de Physique du Collège de France
- Johann Radon Institute for Computational and Applied Mathematics
- John P. Hussman Institute for Human Genomics
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