- Jalpaiguri Government Engineering College
- James Madison University
- Janelia Research Campus [Ashburn]
- Jan Kochanowski University
- Jellysmack
- Jet Propulsion Laboratory
- Jiangnan University
- JiangSu University
- Jilin Normal University
- Johannes Gutenberg - Universität Mainz = Johannes Gutenberg University
- Johann-Friedrich Blumenbach Institut für Zoologie und Anthropologie
- John Radcliffe Hospital [Oxford University Hospital]
- Johns Hopkins University