Africa 
China 
Japan 
MENA 
- Mitral cells
- Mitral regurgitation
- Mitral stenosis
- Mitral valve
- Mitral valve annuloplasty
- Mitral valve prolapse
- Mitral valve replacement
- Mitral valve stenosis
- Mitraphylline
- Mitrofanoff appendicovesicostomy
- Mitrofanoff principle
- Mittelschmerz
- Mitten
- Mixed acid fermentation
- Mixed anxiety-depressive disorder
- Mixed connective tissue disease
- Mixed episode
- Mixed gonadal dysgenesis
- Mixed incontinence
- Mixed lymphocyte reaction
- Mixed nerve
- Mixed transcortical aphasia
- Mixed-function oxidase
- Mixed-phenotype acute leukemia
- Mixing study
- Mixotrophs
- Mixotrophy
- Mixtures
- Mnemonics
- Mobile elements
- Mobility aid
- Mobilization
- Mobilome
- Mobiluncus
- Mocetinostat
- Moclobemide
- Modafinil
- Modal haplotype
- Mode
- Mode Deactivation Therapy
- Mode of action
- Model for End Stage Liver Disease
- Model for End-Stage Liver Disease
- Model organisms
- Modeling
- Moderator band
- Modern chemistry
- Moderna COVID-19 vaccine
- Modes of toxic action
- Modic changes
- Modifications
- Modified Ashworth scale
- Modified Checklist for Autism in Toddlers
- Modified Overt Aggression Scale
- Modified citrus pectin
- Modified radical mastectomy
- Modified starch
- Modifier genes
- Modiolus
- Modularity
- Modulation
- Moebius syndrome
- Moens-Korteweg equation
- Moesin
- Moexipril
- Mogamulizumab
- Mogibacterium
- Mogroside
- Mohr-Tranebjaerg syndrome
- Mohr-Tranebjærg syndrome
- Mohs surgery
- Moiety
- Moisturizer
- Mokken scale
- Molar
- Molar absorptivity
- Molar pregnancy
- Molar tooth
- Molecular anatomy
- Molecular beacons
- Molecular biology
- Molecular breast imaging
- Molecular breeding
- Molecular chaperones
- Molecular clock
- Molecular cloning
- Molecular cytogenetics
- Molecular descriptor
- Molecular diagnostics
- Molecular diffusion
- Molecular docking
- Molecular dynamics
- Molecular electronics
- Molecular epidemiology
- Molecular evolution
- Molecular formula
- Molecular genetics
- Molecular geometry
- Molecular imaging
- Molecular imprinting
- Molecular machines
- Molecular markers
- Molecular mechanics
- Molecular medicine
- Molecular mimicry
- Molecular modeling
- Molecular modelling
- Molecular motors
- Molecular neuroscience
- Molecular oncology
- Molecular orbitals
- Molecular oxygen
- Molecular pathological epidemiology
- Molecular pathology
- Molecular phenotyping
- Molecular phylogeny
- Molecular promiscuity
- Molecular sensors
- Molecular sieves
- Molecular size
- Molecular structure
- Molecular switches
- Molecular weight cut off
- Molecularly targeted therapy
- Molecule
- Molgramostim
- Molindone
- Molisch's test
- Mollaret's meningitis
- Mollicutes
- Molluscum contagiosum
- Molluscum contagiosum virus
- Molnupiravir
- Molsidomine
- Molten globule
- Molting
- Molybdate
- Molybdenum
- Molybdenum blue
- Molybdenum cofactor deficiency
- Molybdenum deficiency
- Molybdopterin
- Mometasone furoate
- Momordica
- Momordica balsamina
- Mondini dysplasia
- Mondor's disease
- Monensin
- Mongolian spots
- Moniliformin