China 
Africa 
- Microtubules
- Microtunneling
- Microturbine
- Microvesicles
- Microvia
- Microvilli
- Microviscosity
- Microvoid coalescence
- Microwave ablation
- Microwave antenna
- Microwave cavity
- Microwave chemistry
- Microwave digestion
- Microwave engineering
- Microwave imaging
- Microwave imaging radiometer with aperture synthesis
- Microwave irradiation
- Microwave ovens
- Microwave power meter
- Microwave spectroscopy
- Microwave thermotherapy
- Microwaves
- Microworlds
- Mid-ocean ridges
- Mid-range
- Midas
- Midbrain
- Middens
- Middle ear
- Middle ear implant
- Middle frontal gyrus
- Middle lamella
- Middle temporal gyrus
- Middleboxes
- Middleware
- Midgut
- Midpoint method
- Midstream
- Mie scattering
- Miedema's model
- Mifepristone
- Miglitol
- Migmatite
- Migration
- Migratory insertion
- Mike 11
- Mike 21C
- Mike She
- Mild cognitive impairment
- Mild hybrid
- Mild-slope equation
- Mildew
- Miliary tuberculosis
- Military
- Military engineering
- Military satellites
- Milk fat globule membrane
- Mill
- Mill scale
- Miller effect
- Miller indices
- Millerite
- Millimeter wave
- Millimetre
- Milling
- Milling cutter
- Milling machine
- Millisecond
- Miltefosine
- Milwaukee brace
- Mimivirus
- Min-entropy
- MinGW
- Mind maps
- Mindfulness
- Mindlin-Reissner plate theory
- Mine closure
- Mine closure planning
- Mine dewatering
- Mine face
- Mine fire
- Mine reclamation
- Mine safety
- Mine shafts
- Mine water
- Mined
- Miner
- Mineral acids
- Mineral alteration
- Mineral dust
- Mineral evolution
- Mineral group
- Mineral oil
- Mineral processing
- Mineral resource classification
- Mineral sands
- Mineral spring
- Mineral wool
- Mineralization
- Mineralized tissues
- Mineralocorticoid
- Mineralogy
- Mineraloids
- Minerals
- Minergie
- Mini-grids
- Miniaturization
- Minicomputers
- Miniemulsion
- Minimal genome
- Minimal polynomial
- Minimal residual method
- Minimal surfaces
- Minimally conscious state
- Minimally invasive
- Minimally invasive procedure
- Minimax
- Minimum bounding box
- Minimum bounding rectangle
- Minimum cut
- Minimum degree algorithm
- Minimum detectable signal
- Minimum ignition energy
- Minimum k-cut
- Minimum phase
- Minimum spanning tree
- Minimum total potential energy principle
- Minimum-cost flow problem
- Minimum-variance unbiased estimator
- Mining
- Mining accidents
- Mining community
- Mining district
- Mining feasibility study
- Mining in Australia
- Mining law
- Mining simulation
- Mining simulator
- Minisatellite
- Minitab
- Minium
- Minkowski addition
- Minkowski distance
- Minkowski space
- Minkowski sum
- Minor actinides
- Minor allele frequency
- Minors
- Minus sign
- Minute ventilation