- Jacobs University = Constructor University [Bremen]
- Jadavpur University
- Jade Hochschule
- Jaipuria Institute of Management [Lucknow]
- Jaipuria Institute of Management [Noida]
- JAK
- Jalpaiguri Government Engineering College
- James Cook University
- James Madison University
- JAMK University of Applied Sciences [Jyväskylä]
- Jan Evangelista Purkyne University
- Japan Advanced Institute of Science and Technology
- Japanese French Laboratory for Informatics
- Japanese Red Cross Kochi Hospital
- Japanese Red Cross Kumamoto Hospital [Kumamoto Hospital]
- Japan Professional School of Education
- Japan Red Cross College of Nursing [Hiroo]
- Japan Science and Technology Agency
- Jawaharlal Nehru University
- Jeju National University
- Jerusalem College of Engineering [Inde]
- Jet Propulsion Laboratory
- JG Communication [Sweden]
- Jiamusi University
- Jia Mu Si University
- Jiamusi University, Jiamusi
- Jianghan University
- Jianglu Mechanical & Electrical Group Co., Ltd
- Jiangnan University
- Jiangsu Academy of Agricultural Sciences
- Jiangsu Key Laboratory of Crop Genetics and Physiology
- Jiangsu Normal University
- Jiangsu Polytechnic University
- Jiangsu Province Hydrology and Water Resources Investigation
- JiangSu University
- Jiangsu University of Science and Technology
- Jiangsu Vocational College of Agriculture and Forestry
- Jiangxi Academy of Agriculture Science
- Jiangxi Agricultural University
- Jiangxi Science & Technology Normal University
- Jiangxi Technical College of Manufacturing
- Jiangxi University of Finance and Economics
- Jiangxi University of Science and Technology
- Jianli Ding, College of Resources and Environment Science
- Jiaxing University
- JiaYing University
- Jilin Jianzhu University
- Jilin Normal University
- Jilin Province Academy of Agricultural Machinery
- Jilin Research Institute of Science and Technology Information [Changchun]
- Jilin University
- Jinan Cigarette Factory
- Jinan University
- Jinan University [Guangzhou]
- Jingdezhen Ceramic Institute
- JingDeZhen Ceramic Institute
- Jinhu Agricultural Mechanization Technology Extension Station, Jinhu county
- JK Lakshmipat University
- JMP Research & Development AB
- JOANNEUM RESEARCH - Institute for Robotics and Mechatronics
- JobBKK
- Johannes Kepler Universität
- Johann Radon Institute for Computational and Applied Mathematics
- John Carroll University
- John Naisbitt University
- Johns Hopkins University
- Johns Hopkins University Applied Physics Laboratory [Laurel, MD]
- Johnson C. Smith University
- John von Neumann Computer Society
- Joint Center for Global Change Studies
- Joint Institute for Nuclear Research
- Joint Research Center Institute for the Protection and Security of the Citizen
- Joint Special Operations University
- Jonkoping University
- Jönköping University
- Jönköping University [Sweden]
- Jozef Stefan Institute [Ljubljana]
- Jozef Stefan International Postgraduate School [Ljubljana, Slovenia]
- 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]
- JSC Angstrem
- JST, ERATO
- Julius-Maximilians-Universität Würzburg = University of Würzburg
- JUNIA
- Juntendo University
- Juola and Associates
- Justus-Liebig-Universität Gießen = Justus Liebig University
- Jyske Bank