Africa 
China 
Japan 
MENA 
- Kernel density estimation
- Kernel fisher discriminant analysis
- Kernel function
- Kernel methods
- Kernel principal component analysis
- Kernel regression
- Kernel smoother
- Kernicterus
- Kerogen
- Kerosene
- Kerr effect
- Kerr-lens modelocking
- Kesterite
- Ketene
- Keto acids
- Ketoacidosis
- Ketone bodies
- Ketones
- Ketonization
- Ketonuria
- Ketoprofen
- Ketorolac
- Ketoses
- Ketosteroids
- Kettle lakes
- Kettles
- Ketyl
- Keuper
- Keuper marl
- Kevlar
- Key authentication
- Key biodiversity area
- Key distribution
- Key escrow
- Key exchange
- Key generation
- Key management
- Key risk indicator
- Key schedule
- Key signature
- Key size
- Key switch
- Key-value pairs
- Key-value store
- Keyboard
- Keygens
- Keying
- Keyless entry
- Keypads
- Keyspace
- Keystream
- Keystroke dynamics
- Keystroke-level model
- Keyway
- Keyword extraction
- Keyword spotting
- Keywords
- Kg
- Kgf
- Kharitonov's theorem
- Khondalite
- Ki-67
- Kidney
- Kidney biopsy
- Kidney cancer
- Kidney dialysis
- Kidney disease
- Kidney failure
- Kidney function
- Kidney stones
- Kidney transplantation
- Kill chain
- Killer-cell immunoglobulin-like receptors
- Killing vector fields
- Kiln
- Kiln furniture
- Kilo
- Kilobyte
- Kilogram
- Kilogram-force
- Kilojoule
- Kilometre
- Kilometres per hour
- Kilopower
- Kilowatt-hour
- Kimberlite
- Kinaesthetics
- Kinase
- Kinase inhibitors
- Kinase insert domain receptor
- Kind
- Kinematic chains
- Kinematic coupling
- Kinematic diagram
- Kinematic pair
- Kinematic similarity
- Kinematic synthesis
- Kinematic wave
- Kinematics
- Kinematics equations
- Kinesin
- Kinesthetic learning
- Kinetic architecture
- Kinetic control
- Kinetic energy
- Kinetic energy penetrator
- Kinetic fractionation
- Kinetic isotope effect
- Kinetic resolution
- Kinetic theory of gases
- Kinetics
- Kinetin
- Kinetochore
- King post
- Kingpins
- Kingpost
- Kininogen
- Kinks
- Kinky hair
- Kinome
- Kips
- Kirchhoff's law of thermal radiation
- Kirkendall effect
- Kirsch equations
- Kissing number
- Kisspeptin
- Kit
- Kit-of-parts
- Kites
- Kiva
- Kjeldahl method
- Klebsiella oxytoca
- Klebsiella pneumoniae
- Kleene star
- Klein Bottle
- Klein four-group
- Klf2
- Klf4
- Klinefelter syndrome
- Klinkenberg correction
- Klippe
- Klondike Gold Rush
- Klystron
- Km2
- Knapsack problem
- Knee
- Knee of a curve
- Knee pain
- Knee replacement
- Kneeling