- Kapteyn Astronomical Institute [Groningen]
- K-Epsilon
- Key Lab of Computer System and Architecture, Institute of Computing Technology [Beijing]
- Key Laboratory for Information System Security
- Key Laboratory of Intelligent Information Processing, Institute of Computing Technology [Beijing]
- Key Laboratory of Machine Perception (MOE)
- Key Laboratory of Mathematics Mechanization
- Kingshill Research Centre, Victoria Hospital
- Kirchhoff Institut für Physik
- Kitware, Inc.