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China 
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- Leukocyturia
- Leukoderma
- Leukodystrophy
- Leukoedema
- Leukoencephalopathy
- Leukokoria
- Leukomalacia
- Leukonychia
- Leukopenia
- Leukoplakia
- Leukopoiesis
- Leukoreduction
- Leukorrhea
- Leukostasis
- Leukotriene A4
- Leukotriene A4 hydrolase
- Leukotriene B4
- Leukotriene B4 receptor
- Leukotriene C4
- Leukotriene C4 synthase
- Leukotriene D4
- Leukotriene receptor
- Leukotriene receptor antagonists
- Leukotriene-A4 hydrolase
- Leukotriene-C4 synthase
- Leukotrienes
- Leupeptin
- Leuprorelin
- Levallorphan
- Levamisole
- Levan
- Levator ani
- Levator labii superioris
- Levator palpebrae superioris
- Levator palpebrae superioris muscle
- Levator scapulae
- Levator scapulae muscle
- Levator veli palatini
- Levatores costarum
- Level of consciousness
- Levetiracetam
- Levinthal's paradox
- Levoamphetamine
- Levobunolol
- Levobupivacaine
- Levocabastine
- Levocardia
- Levocetirizine
- Levodopa
- Levodopa-induced dyskinesia
- Levodropropizine
- Levofloxacin
- Levomethadone
- Levomethorphan
- Levomilnacipran
- Levonorgestrel
- Levonorgestrel releasing intrauterine system
- Levormeloxifene
- Levorphanol
- Levosulpiride
- Levothyroxine
- Lewis acid catalysis
- Lewisite
- Lewy bodies
- Lewy body
- Lewy body dementia
- Lexatumumab
- Lexical decision task
- Lexipafant
- Leydig cell hypoplasia
- Leydig cell tumour
- Leydig cells
- Lhermitte's sign
- Li-Fraumeni syndrome
- Liaison psychiatry
- Lianhua Qingwen
- Libido
- Libman-Sacks endocarditis
- Licarbazepine
- Lichen aureus
- Lichen myxedematosus
- Lichen nitidus
- Lichen planus
- Lichen sclerosus
- Lichen sclerosus et atrophicus
- Lichen spinulosus
- Lichen striatus
- Lichenin
- Lichenoid
- Lichens
- Licking
- Licofelone
- Licorice
- Lid lag
- Liddle syndrome
- Liddle's syndrome
- Lidocaine
- Lidocaine prilocaine
- Lie detection
- Liebowitz social anxiety scale
- Life Events and Difficulties Schedule
- Life expectancy
- Life extension
- Life history
- Life satisfaction
- Life story work
- Life support
- Life tables
- Life-events and difficulties schedule
- Life-years lost
- Lifelong learning
- Lifespan
- Lifestyle
- Lifestyle diseases
- Lifestyle drugs
- Lifestyle medicine
- Lifestyle modification
- Lifitegrast
- Lig4 syndrome
- Ligament
- Ligamentotaxis
- Ligamentous laxity
- Ligamentum arteriosum
- Ligamentum flavum
- Ligamentum venosum
- Ligand
- Ligand binding
- Ligand binding assay
- Ligand efficiency
- Ligand-gated ion channel
- Ligand-gated ion channels
- Ligase Chain Reaction
- Light Scattering Spectroscopy
- Light absorption
- Light amplification by stimulated emission of radiation
- Light beam
- Light chain
- Light chain deposition disease
- Light element
- Light emitting diodes
- Light field microscopy
- Light rays
- Light scattering
- Light sheet fluorescence microscopy
- Light therapy
- Light transmission
- Light-chain deposition disease
- Light-dark box test
- Light-gated ion channels
- Light-harvesting complexes