- 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
- Kniest dysplasia
- 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
- Koro
- Korotkoff sound
- Korotkoff sounds
- Korsakoff psychosis
- Korsakoff syndrome
- Korsakoff's syndrome
- Kounis syndrome
- Kovac's reagent
- Kozak consensus sequence
- Krabbe disease
- Krafft temperature
- Krause's end-bulbs
- Krause's glands
- Krebs cycle
- Kriging
- Krill oil
- Kringle domains
- Krukenberg tumor
- Krukenberg's spindle
- Kruppel-like factors
- Kruskal-Wallis test
- Krypton-85
- Kt/v
- Kuder-Richardson formulas
- Kudzu
- Kufor-Rakeb syndrome
- Kunitz domain
- Kunjin virus
- Kupffer cells
- Kussmaul breathing
- Kussmaul's sign
- Kv
- KvLQT1
- Kwashiorkor
- Kyasanur Forest Disease Virus
- Kyasanur Forest disease
- Kymograph
- Kynurenic acid
- Kynureninase
- Kynurenine
- Kynurenine 3-monooxygenase
- Kyphoplasty
- Kyphoscoliosis
- Kyphosis
- Kytococcus sedentarius
- L amino acid oxidase
- L glucose
- L ring
- L thyroxine
- L-Dopa
- L-Dopaquinone
- L-alanine
- L-dopa
- L-form bacteria
- L-gulonolactone oxidase
- L-moment
- L-type calcium channels
- L-tyrosine
- L-xylulose reductase
- L1
- L1CAM
- LABA
- LAD1
- LAIR1
- LAMP1
- LAMP2
- LAMP3
- LANA
- LAPC4
- LATS1
- LATS2
- LC50
- LCAT
- LCIS
- LCK
- LD50
- LDL
- LDL apheresis