- M-estimate
- M-estimator
- M-matrix
- Macaulay ring
- Macdonald function
- Macdonald identities
- Macdonald polynomial
- Macdonald's constant-term conjecture
- Macdonald-Kostka polynomial
- Mach number
- Mach principle
- Machin's formula
- Machin-like formulas
- Machine
- Machine learning or Machine Learning
- MacIntyre
- Mackey topology
- Maclaurin integral test
- Maclaurin polynomial
- Maclaurin series or MacLaurin series
- Macron
- MacWilliams identities
- Magic circles
- Magic constant
- Magic Cube or Magic cube
- Magic graph
- Magic hexagon
- Magic Number or Magic number
- Magic Series or Magic series
- Magic square or Magic Square
- Magic Star or Magic star
- Magic tesseract
- Magma or MAGMA
- Magnetic charge
- Magnetic declination
- Magnetic field or Magnetic Field
- Magnetic induction
- Magnetic monopole
- Magnetic permeability
- Magnetism
- Mahalanobis distance
- Mahler measure
- Main diagonal
- Mainardi-Codazzi equations
- Major arc
- Major axis
- Majorization
- Mal'tsev algebra
- Malfatti circles
- Malliavin calculus
- Maltese Cross or Maltese cross
- Malthusian parameter
- Mandelbrot set or Mandelbrot Set
- Mandelbrot Tree or Mandelbrot tree
- Mangoldt function
- Mangoldt summatory function
- Manhattan distance
- Manifold
- Manifold with boundary
- locally Euclidean or locally euclidean
- Manin-Mumford conjecture
- Mann-Whitney test
- MANOVA
- Mantel's theorem
- Mantissa
- Many valued logic
- Many-valued logic
- Map
- Map (mathematics)
- Map coloring
- Map Projection or Map projection
- Map winding number
- Maple
- Mapping
- Mapping class group
- Mapping cylinder
- Mapping torus
- Marcellus
- Margin of Error or Margin of error
- Marginal analysis
- Marginal distribution
- Marginal probability
- Maria Gaetana Agnesi or Maria gaetana agnesi
- Marianna Csörnyei or Marianna csörnyei
- Marienbad
- Markoff Chain or Markoff chain
- Markoff number
- Markov algorithm
- Markov chain or Markov Chain
- Markov inequality
- Markov matrix
- Markov number
- Markov process
- Markov property
- Markov sequence
- Markov's inequality
- Marriage theorem or Marriage Theorem
- Marshall-Edgeworth Index or Marshall-Edgeworth index or Marshall-edgeworth index
- Martin's axiom or Martin's Axiom
- Martingale
- Maryam Mirzakhani
- Mascheroni constant
- Maschke's theorem
- Maslov index
- Mason's theorem
- Mass
- Mastermind
- Matching
- Math
- Mathematica
- Mathematical abstraction
- Mathematical analysis
- Mathematical Association of America
- Mathematical constant
- Mathematical crystallography
- Mathematical economics
- Mathematical function
- Mathematical induction or Mathematical Induction
- Mathematical jargon
- Mathematical linguistics
- Mathematical logic or Mathematical Logic
- Mathematical model
- Mathematical morphology
- Mathematical physics or Mathematical Physics
- Mathematical programming
- Mathematical statistics
- Mathematical symbols
- Mathematical theory of optimal control
- Mathematics
- Mathematics contests
- Mathematics of finance
- Mathematics Prizes or Mathematics prizes
- Mathematics problems
- Mathematics Subject Classification or Mathematics subject classification
- Mathieu differential equation
- Mathieu equation
- Mathieu function
- Mathieu functions
- Mathieu group
- Mathieu groups
- MathML or Mathml
- Maths
- MathWorld or Mathworld
- MATLAB or Matlab
- Matrix
- Matrix (mathematics)
- Matrix 1-inverse
- Matrix addition
- Matrix algebra
- Matrix condition number
- Matrix decomposition
- Matrix diagonalization
- Matrix Element or Matrix element
- Matrix exponential
- Matrix factorization
- Matrix group
- Matrix index
- Matrix inverse
- Matrix inversion
- Matrix inversion lemma
- Matrix logarithm
- Matrix multiplication
- Matrix norm
- Matrix p-norm
- Matrix product
- Matrix rank
- Matrix ring
- Matrix square root
- Matrix trace
- Matrix transpose
- Matroid
- Matroid independence axioms
- Maupertuis' principle
- Maurer-Cartan form
- Max
- Max Deuring
- Max flow min cut theorem
- Max-flow, mincut theorem
- Maxcut
- Maximal clique
- Maximal compact subgroup
- Maximal condition
- Maximal element
- Maximal ergodic theorem
- Maximal ideal
- Maximal independent set
- Maximal order
- Maximal subgroup
- Maximal Sum-Free Set or Maximal sum-free set
- Maximal torus
- Maximin
- Maximin criterion
- Maximin principle
- Maximization
- Maximum
- Maximum clique problem
- Maximum entropy method
- Maximum flow, minimum cut theorem
- Maximum independent set
- Maximum independent set problem
- Maximum Likelihood or Maximum likelihood
- Maximum likelihood estimator
- Maximum likelihood method
- Maximum modulus principle
- Maximum principle
- Maximum-likelihood method
- Maximum-modulus principle
- Maxwell Distribution or Maxwell distribution
- Maxwell Equations or Maxwell equations
- May's Theorem or May's theorem
- Mayer-Vietoris sequence or Mayer-vietoris sequence
- Maze
- Mazur-Ulam theorem
- McCarthy 91 function
- Mccarthy 91-function
- McLaughlin Group or Mclaughlin group
- McNugget number
- Meager
- Meager set
- Meagre set
- Mean
- Mean Absolute Deviation or Mean absolute deviation
- Mean curvature
- Mean Deviation or Mean deviation
- Mean square error
- Mean value theorem or Mean Value Theorem
- Mean-value theorem or Mean-Value Theorem
- Measurable function
- Measurable mapping
- Measurable set
- Measurable space
- Measure
- Measure (mathematics)
- Measure of irrationality
- Measure polytope
- Measure space
- Measure Theory or Measure theory
- Measure zero
- Measure-preserving
- Measure-preserving transformation
- Mebibyte
- Medial
- Medial axis
- Medial circle
- Medial triangle
- Median
- Median (geometry)
- Median (in statistics)
- Mediant
- Mediator
- Meet
- Meet continuous
- Mega
- Megabyte
- Megistron
- Meijer G-function
- Mellin transform
- Mellin's formula
- Mellin's inverse formula
- MEM or Mem
- Memoryless
- Memorylessness
- Menedemus of Pyrrha
- Menelaus theorem
- Menelaus' theorem
- Menger sponge
- Menger's n-arc theorem
- Menger's Theorem or Menger's theorem
- Mercator projection or Mercator Projection
- Mercator series or Mercator Series
- Mercer theorem
- Mercer's theorem
- Merge Sort or Merge sort
- Mergelyan theorem
- Mergelyan's theorem
- Meridian
- Merkaba
- Meromorphic function
- Mersenne Number or Mersenne number
- Mersenne numbers
- Mersenne Prime or Mersenne prime
- Mertens conjecture
- Mertens constant
- Mertens function
- Mertens theorem
- Mertens' first theorem
- Mesh
- Mesokurtic
- Meta-Abelian group or Meta-abelian group
- Meta-language
- Meta-logic
- Meta-mathematics
- Meta-theory
- Metabelian group
- Metabiaugmented dodecahedron
- Metabiaugmented hexagonal prism
- Metabiaugmented truncated dodecahedron
- Metabidiminished icosahedron
- Metabidiminished rhombicosidodecahedron
- Metabigyrate rhombicosidodecahedron
- Metacompact
- Metacompact space
- Metacyclic group
- Metagyrate diminished rhombicosidodecahedron
- Metalogic
- Metamathematics
- Metaphysics
- Metaplectic group
- Metatheorem
- Metatheory
- Method
- Method of characteristics
- Method of complex integration
- Method of conjugate gradients
- Method of contour integration
- Method of exhaustion or Method of Exhaustion
- Method of false position
- Method of least squares
- Method of moments
- Method of separation of variables
- Method of steepest descent
- Method of the stationary phase
- Method of undetermined coefficients
- Method of variation of the parameter
- Methods of computing square roots
- Metric
- Metric
- Metric connection
- Metric dimension
- Metric space
- Metric spaces
- Metric tensor
- Metric topology
- Metric transitivity
- Metrizable
- Metrizable space
- Metropolis Algorithm or Metropolis algorithm
- Meusnier's theorem
- Mex
- Mex
- Meyer's theorem
- Mian-Chowla sequence
- Mice problem
- Michael Golomb
- Michaelis-Menten equation
- Microlocal analysis
- Midpoint
- Midrange
- Midsphere
- Midy's Theorem or Midy's theorem
- Milky Way or Milky way
- Millennium Problems
- Miller cylindrical projection
- Miller-Rabin prime test
- Milliard
- Million
- Mills' constant
- Mills' prime
- Milnor sphere
- Milnor's conjecture
- MIMD
- Min
- Mina Rees
- Minesweeper
- Minimal condition
- Minimal model
- Minimal polynomial
- Minimal prime
- Minimal residual method
- Minimal surface
- Minimax
- Minimax theorem
- Minimization
- Minimum
- Minimum modulus principle
- Minimum spanning tree
- Minimum vertex cover
- Minkowski addition
- Minkowski functional
- Minkowski geometry
- Minkowski inequality
- Minkowski metric
- Minkowski space
- Minkowski sum
- Minkowski theorem
- Minkowski's constant
- Minkowski's function
- Minkowski's inequalities
- Minkowski's question mark function
- Minkowski's theorem
- Minkowski-Bouligand dimension
- Minkowski-Hlawka Theorem or Minkowski-Hlawka theorem
- Minor
- Minor (graph theory)
- Minor arc
- Minor axis
- Minuend
- Minus
- Minus sign
- Minute
- Mirimanoff's Congruence or Mirimanoff's congruence
- Mirror Image or Mirror image
- Mirror Plane or Mirror plane
- Mirror Symmetry or Mirror symmetry
- Missing Dollar Paradox or Missing dollar paradox
- Mittag-Leffler function or Mittag-leffler function or Mittag-Leffler Function
- Mittag-Leffler star
- Mittag-Leffler theorem
- Mittag-Leffler's theorem
- Mixed fraction
- Mixed Hodge structure
- Mixed partial derivative
- Mixed Strategy or Mixed strategy
- Mixed Tensor or Mixed tensor
- Mixing
- Mnemonic
- Mnemonic device
- Mock theta function
- Mod
- Modal logic
- Modality
- Mode
- mode
- Mode locking
- Model
- Model (in logic)
- Model theory or Model Theory
- Model theory of valued fields
- Modification
- Modular angle
- Modular arithmetic or Modular Arithmetic
- Modular curve
- Modular discriminant
- Modular equation
- Modular form
- Modular function
- Modular group
- Modular group gamma or Modular group Gamma
- Modular group Gamma0
- Modular group Lambda
- Modular inverse
- Modular lattice
- Module
- Module (mathematics)
- Module homomorphism
- Module of finite rank
- Moduli problem
- Moduli space
- Moduli theory
- Modulo
- Modulus
- Modulus of continuity
- Modus ponens or Modus Ponens
- Modus tollens or Modus Tollens
- Moebius
- Moebius function
- Moebius inversion formula
- Moiré pattern
- Molien series
- Mollifier
- Mollweide projection
- Moment
- Moment (mathematics)
- Moment map
- Moment matrix
- Moment problem
- Moment-generating function
- Momentum map
- Monad
- Monad (category theory)
- Monge's Shuffle or Monge's shuffle
- Monge-Ampère equation
- Monic
- Monic polynomial
- Monkey saddle
- Monodromy
- Monodromy group
- Monodromy matrix
- Monodromy theorem
- Monohedral tiling
- Monoid
- Monoidal category
- Monoidal transformation
- Monomial
- Monomial matrix
- Monomial order
- Monomial representation
- Monomino
- Monomorphism
- Monotone
- Monotone class theorem
- Monotone convergence theorem
- Monotone decreasing
- Monotone function
- Monotone increasing
- Monotone operator
- Monotone sequence
- Monotonic
- Monotonic function or Monotonic Function
- Monotonically decreasing
- Monotonically increasing
- Monotonically nondecreasing
- Monotonically nonincreasing
- Monotonicity criterion
- Monster group
- Monstrous Moonshine or Monstrous moonshine
- Monte Carlo Integration or Monte Carlo integration
- Monte Carlo Method or Monte Carlo method or Monte carlo method
- Monte Carlo methods or Monte carlo methods
- Monte Carlo simulation or Monte carlo simulation
- Monte-Carlo method
- Montel space
- Montel theorem
- Montel's theorem
- Monty Hall dilemma
- Monty Hall Problem or Monty Hall problem or Monty hall problem
- Moonshine conjectures
- Moore graph
- Moore neighborhood
- Moore space
- Moore space (topology)
- Moore-Penrose generalized inverse or Moore-penrose generalized inverse
- Moore-Penrose Matrix Inverse or Moore-Penrose matrix inverse or Moore-penrose matrix inverse
- Mordell conjecture
- Mordell curve
- Mordell-Weil theorem
- Morera theorem
- Morera's theorem or Morera's Theorem
- Morita equivalence
- Moritz Stern
- Morley rank
- Morley's theorem
- Morley's triangle
- Morphism
- Morrie's law
- Morse function
- Morse homology
- Morse index
- Morse lemma
- Morse Theory or Morse theory
- Morse's lemma
- Morse-Thue sequence
- Mortal
- Mortgage
- Mosaic
- Moser
- Most significant digit
- Motion
- Motive
- Motivic cohomology
- Motzkin number
- Moufang identities
- Moufang loop
- Mountain pass theorem
- Mousetrap
- Mouth
- Movable singularity
- Moving average
- Moving frame
- Moving sofa problem
- Mu Function or Mu function
- Mu-operator
- Muirhead's theorem
- Muller's method
- Multi-criteria decision making
- Multi-dimensional distribution
- Multi-index notation
- Multi-linear
- Multi-valued function
- Multidimensional arithmetic progression
- Multifactorial
- Multifractal
- Multigraph
- Multigrid methods
- Multilinear
- Multilinear algebra
- Multilinear form
- Multimagic cube
- Multimagic square
- Multimodal
- Multimodal distribution
- Multinomial
- Multinomial coefficient
- Multinomial distribution
- Multinomial series
- Multinomial theorem
- Multinormal distribution
- Multiperfect number
- Multiple
- Multiple comparison
- Multiple edge
- Multiple integral
- Multiple regression
- Multiple root
- Multiple-valued function
- Multiplicand
- Multiplication
- Multiplication operator
- Multiplication principle
- Multiplication sign
- Multiplication table
- Multiplicative digital root
- Multiplicative ergodic theorem
- Multiplicative function
- Multiplicative group
- Multiplicative identity
- Multiplicative inverse
- Multiplicative order
- Multiplicative semi-group
- Multiplicative set
- Multiplicity
- Multiplicity of a restricted root
- Multiplicity of a root
- Multiplier
- Multipliers
- Multiply connected
- Multiply perfect number
- Multiply transitive
- Multipolynomial quadratic sieve
- Multiresolution analysis or Multiresolution Analysis
- Multiset
- Multivalent function
- Multivalued function
- Multivariable Calculus or Multivariable calculus
- Multivariate
- Multivariate Analysis or Multivariate analysis
- Multivariate calculus
- Multivariate gamma function
- Multivariate normal distribution
- Multivariate statistics
- Munching squares
- Mutant knot
- Mutation
- Mutual information or Mutual Information
- Mutually coprime
- Mutually Exclusive Events or Mutually exclusive events
- Mycielski graph
- Myriad
- Myriagon
- Möbius band
- Möbius function
- Möbius group
- Möbius inversion
- Möbius inversion formula
- Möbius ladder
- Möbius strip or Möbius Strip
- Möbius transform
- Möbius transformation or Möbius Transformation
- Müller-Lyer Illusion or Müller-Lyer illusion
- Müntz-Szasz theorem
