- Kamerlingh Onnes Laboratory, Leiden University, P.O. Box 9506, 2300 RA
- Kandai University
- KanORS-EMR
- Kavli Institute for the Physics and Mathematics of the Universe [Tokyo]
- Keio Economic Observatory
- Key Lab of Cryptologic Technology and Information Security
- Key Laboratory for Information System Security
- Key Laboratory of Heavy Ion Radiation Medicine of Gansu Province
- Key Laboratory of Horticultural Plant Biology
- Key Laboratory of Materials for High Power Laser
- Key Laboratory of Mathematics Mechanization
- Key Laboratory of New Processing Technology for Nonferrous Metals and Materials
- Key Laboratory of Plant Nutrition
- Key Laboratory of Plant-Soil Interactions - College of Resources and Environmental Sciences
- Key Laboratory of Thermo-Fluid Science and Engineering of Ministry of Education
- Key Laboratory of Tree Breeding and Cultivation
- Kiel Institute for the World Economy
- Kiev Institute for Nuclear Research
- Kirchhoff Institute for Physics
- Kirstenbosch Research Center
- Kirstenbosch Research Centre