- Keratosis
- Keratosis pilaris
- Kerion
- Kerma
- Kernel density estimation
- Kernel methods
- Kernel smoother
- Kernicterus
- Kernig's sign
- Kernohan's notch
- Kerosene
- Kerteszia
- Keshan disease
- Ketal
- Ketamine
- Ketazocine
- Ketazolam
- Ketene
- Keto enol tautomerism
- Ketoacidosis
- Ketoacyl synthase
- Ketobemidone
- Ketoconazole
- Ketodarolutamide
- Ketogenesis
- Ketogenic amino acids
- Ketohexokinase
- Ketolysis
- Ketone bodies
- Ketones
- Ketonuria
- Ketoprofen
- Ketorolac
- Ketosis
- Ketosis-prone diabetes
- Ketotic hypoglycemia
- Ketotifen
- Kexin
- Khat
- Khellin
- Khusimol
- Ki-67
- Kiddie Schedule for Affective Disorders and Schizophrenia
- Kidney
- Kidney beans
- Kidney biopsy
- Kidney cancer
- Kidney cortex
- Kidney cyst
- Kidney development
- Kidney disease
- Kidney failure
- Kidney glomerulus
- Kidney infection
- Kidney ischemia
- Kidney medulla
- Kidney pelvis
- Kidney stones
- Kidney transplant
- Kidney tubule
- Kidney tubules
- Kiesselbach's plexus
- Kikuchi disease
- Killip class
- Kin selection
- Kinanthropometry
- Kinase inhibitors
- Kinase insert domain receptor
- Kinases
- Kindler syndrome
- Kinect
- Kinesin
- Kinesiology
- Kinesthesia
- Kinetic isotope effect
- Kinetic resolution
- Kinetic scheme
- Kinetics
- Kinetin
- Kinetochore
- Kinetochores
- Kinetoplast
- King's College Criteria
- Kingdom
- Kingella
- Kingella kingae
- Kinin-kallikrein system
- Kininogen
- Kinins
- Kinky hair
- Kino
- Kinocilium
- Kinome
- Kinsey scale
- Kirschner wire
- Kiss
- Kiss1r
- Kisspeptin
- Kiwifruit
- Kjeldahl method
- Klatskin tumor
- Klebsiella
- Klebsiella aerogenes
- Klebsiella oxytoca
- Klebsiella pneumoniae
- Kleefstra syndrome
- Klein Sexual Orientation Grid
- Kleine-Levin Syndrome
- Kleine-Levin syndrome
- Klenow fragment
- Kleptomania
- Klinefelter syndrome
- Klippel Feil Syndrome
- Klippel-Feil syndrome
- Klotho
- Kluver Bucy Syndrome
- Kluyvera
- Kluyveromyces marxianus
- Knee
- Knee dislocation
- Knee effusion
- Knee examination
- Knee joint
- Knee pain
- Knee replacement
- Kneeling
- Knobloch syndrome
- Knockdown resistance
- Knockout gene
- Knowledge of results
- Knowledge space
- Knowledge transfer
- Knuckle pads
- Kobuvirus
- Koch's triangle
- Kocher manoeuvre
- Kocher's point
- Kocuria
- Koebner phenomenon
- Koilocytes
- Koilonychia
- Kojic acid
- Kola nut
- Kola nuts
- Kolmogorov-Smirnov
- Kolmogorov-Smirnov test
- Kombucha
- Konjac
- Konzo
- Koplik's spots