- Lenzilumab
- Leonine facies
- Leonurine
- Leopard syndrome
- Lepidium meyenii
- Lepirudin
- Lepromatous leprosy
- Leprosarium
- Leprosy
- Leptin
- Leptin receptor
- Leptomeningeal carcinomatosis
- Leptomonas
- Leptospira
- Leptospiraceae
- Leptospirosis
- Leptotene stage
- Lercanidipine
- Lesch Nyhan Syndrome
- Lesch-Nyhan syndrome
- Lesions
- Lesser curvature
- Lesser occipital nerve
- Lesser omentum
- Lesser palatine canals
- Lesser palatine nerve
- Lesser pelvis
- Lesser sac
- Lesser sciatic foramen
- Lesser sciatic notch
- Lesser trochanter
- Lesser tubercle
- Lestaurtinib
- Letermovir
- Lethal concentration
- Lethal dose
- Lethal dose 50
- Lethal midline granuloma
- Lethality
- Lethargy
- Letrozole
- Letterer-Siwe disease
- Letting die
- Leu-enkephalin
- Leucine
- Leucine zipper
- Leucine-rich repeat
- Leucines
- Leucocyanidin
- Leuconostoc
- Leucopelargonidin
- Leucoplasts
- Leucyl aminopeptidase
- Leukaemia
- Leukapheresis
- Leukemia
- Leukemia cutis
- Leukemoid reaction
- Leukoaraiosis
- Leukocidin
- Leukocoria
- Leukocyte adhesion deficiency
- Leukocyte adhesion deficiency-1
- Leukocyte count
- Leukocyte esterase
- Leukocyte extravasation
- Leukocyte immunoglobulin-like receptors
- Leukocytes
- Leukocytoclastic vasculitis
- Leukocytosis
- 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 myxedematosus