- Maclaurin polynomial - see Taylor polynomial
- manipulating series - see Series - Methods Survey - Series of functions - Manipulating power series
- mapping
- mass of a solid - see Integrals - Theory - Applications - Mass
- maximum of a function, global/local - see extrema of functions
- maximum of a set - see Functions - Theory - Real numbers - Topological notions
- mean of a function - see Integrals - Theory - Applications - Average
- Mean Value Theorem (MVT) - see Derivatives - Theory - MVT - MVT and comp.
- Mean Value Theorem (MVT) for integrals - see Integrals - Theory - Introduction - More properties, see also average
- minimum of a function, global/local - see extrema of functions
- minimum of a set - see Functions - Theory - Real numbers - Topological notions
- monotone function - see monotonicity of functions
- monotonicity of functions global (on a set)/local (at a point)
- monotonicity of sequences
- monotonicity and sequences of functions - see Series - Theory - Series of functions - Sequences of functions
- multiplication of functions - see Functions - Theory - Real functions - Operations
- multiplication of sequences - see Sequences - Theory - Introduction - Operations, and limit: Sequences - Theory - Limit - Properties
- multiplication of series of real numbers - see Series - Theory - Introduction - Basic properties
- multiplicity of root - see root of a function
- multiplying trick for partial fractions - see Integrals - Methods Survey - Methods of integration - Partial fractions