- Mechanical energy
- Mechanical engineering
- Mechanical equivalent of heat
- Mechanical impedance
- Mechanical index
- Mechanical joint
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- Mechanical network
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- Mechanical properties of biomaterials
- Mechanical rectifier
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- Mechanically stabilized earth
- Mechanism of action
- Mechanistic
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- Media filter
- Media server
- Media-independent handover
- MediaWiki
- Medial axis
- Medial epicondyle
- Medial epicondyle of the humerus
- Medial forebrain bundle
- Medial geniculate nucleus
- Medial malleolus
- Medial meniscus
- Median
- Median absolute deviation
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- Median age
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- Medieval Warm Period
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- Mega
- Megabytes
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- Megakaryocytes
- Megathrust earthquakes
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- Megestrol
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- Meibomian gland dysfunction
- Meibomian glands
- Meionite
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- Mellitic acid
- Meloidogyne incognita
- Melon
- Melphalan
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- Melt blowing
- Melt inclusions
- Melt ponds
- Melt spinning
- Meltdown
- Melting