- Kantha Bopha Hospitals Foundation
- Kapteyn Astronomical Institute [Groningen]
- Kaunas University of Technology
- Kerlabs
- Key Laboratory for Computer Network of Shandong Province [Shandong Computer Science Center]
- Key Laboratory of Marine Geology and Environment [China
- Key Laboratory of Mathematics Mechanization
- Key Laboratory of Pervasive Computing
- Key Laboratory of Plant Nutrition
- Key Laboratory of Plant-Soil Interactions - College of Resources and Environmental Sciences
- Key Laboratory of Tree Breeding and Cultivation
- King's College London School of Medicine at Guy's, King's College and St Thomas' Hospitals
- Knight Foundation - School of Computing and Information Sciences [Miami]
- Knowledge Media Institute
- Konrad-Zuse-Zentrum für Informationstechnik Berlin
- Korteweg-de Vries Institute for Mathematics
- KRDB Research Centre
- KXEN