China 
Africa 
- Left atrium
- Left axis deviation
- Left bundle branch block
- Left colic artery
- Left colic vein
- Left common carotid artery
- Left coronary artery
- Left gastric artery
- Left gastric vein
- Left marginal artery
- Left marginal vein
- Left pulmonary artery
- Left subclavian artery
- Left testicular vein
- Left ventricle
- Left ventricular hypertrophy
- Left ventricular thrombus
- Left-handedness
- Left-right asymmetry
- Leg
- Leg cramps
- Leg length inequality
- Leg raises
- Legal death
- Legal psychology
- Legionella
- Legionella pneumophila
- Legionellales
- Legionnaires' disease
- Legitimate peripheral participation
- Legius syndrome
- Legume lectin
- Legumes
- Leguminous plant
- Leigh syndrome
- Leigh's disease
- Leiomyoma
- Leiomyosarcoma
- Leishman stain
- Leishmania
- Leishmania amazonensis
- Leishmania braziliensis
- Leishmania donovani
- Leishmania infantum
- Leishmania major
- Leishmania tropica
- Leishmaniasis
- Leloir pathway
- Lemborexant
- Lemierre's syndrome
- Lemnisci
- Lemniscus
- Lenalidomide
- Length constant
- Length of stay
- Length time bias
- Lennox Gastaut Syndrome
- Lennox-Gastaut syndrome
- Lenograstim
- Lens
- Lens capsule
- Lens dislocation
- Lens distortion
- Lens placode
- Lens regeneration
- Lens subluxation
- Lenticonus
- Lenticulostriate arteries
- Lentiform nucleus
- Lentigines
- Lentiginosis
- Lentigo
- Lentigo maligna
- Lentigo maligna melanoma
- Lentils
- Lentinan
- Lentinula edodes
- Lentiviruses
- Lenvatinib
- 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
- Leuco dye
- 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