- N
- N! theorem
- N-cube
- N-omino
- N-Space or N-space
- N-sphere
- N-tuple
- N-vector
- Nabla
- Nagel point
- Nagell-Lutz theorem or Nagell-lutz theorem
- Naive Set Theory or Naive set theory
- Nakai-Moishezon criterion
- Nakayama's lemma
- Naked singularity
- Name
- NAND or Nand
- Napier's Bones or Napier's bones
- Napier's constant
- Napier's rods
- Napierian logarithm
- Napoleon's Problem or Napoleon's problem
- Napoleon's theorem
- Nappe
- Narcissistic number
- Nash equilibrium or Nash Equilibrium
- Nash isometric embedding theorem
- Nash theorem (in game theory)
- Nash theorems (in differential geometry)
- Nash's embedding theorem
- Nash's Theorem or Nash's theorem
- Nat or NAT
- National Science Foundation
- Natural barrier
- Natural boundary
- Natural deduction
- Natural density
- Natural equivalence
- Natural frequencies
- Natural homomorphism
- Natural language processing or Natural Language Processing
- Natural logarithm
- Natural number
- Natural numbers object
- Natural parameter
- Natural transformation
- Naught
- Naughts and crosses
- Navier-Stokes Equations or Navier-Stokes equations or Navier-stokes equations
- Navigation problem
- Nc
- ND or Nd
- Near-ring
- Nearest integer function
- Nearest neighbor
- Nearest neighbor problem
- Necessary
- Necessary and sufficient
- Necessary and sufficient conditions
- Necker Cube or Necker cube
- Necklace
- Needle
- Negabinary
- Negadecimal
- Negation
- Negation sign
- Negative
- Negative and non-negative numbers
- Negative binomial distribution
- Negative definite
- Negative definite matrix
- Negative integer
- Negative number
- Negative part
- Negative pedal curve
- Negative root
- Negative semidefinite
- Negative semidefinite matrix
- Neighborhood
- Neighborhood retract
- Neighborhood system
- Neighbourhood
- Neighbourhood (mathematics)
- Neighbourhood system
- Neil J. A. Sloane
- Neile's parabola
- Nelder-Mead method
- Neoplatonist
- Nephroid
- Nerve
- Nesbitt's inequality
- Nest
- Nested function
- Nested radical
- Net (mathematics)
- Net (of sets in a topological space)
- Network
- Network Flow or Network flow
- Network model
- Neumann boundary conditions
- Neumann function
- Neumann problem
- Neumann series
- Neural network
- Neusis construction
- Neutral geometry
- Neutrally stable fixed point
- Nevanlinna Prize or Nevanlinna prize
- Nevanlinna theorems
- Nevanlinna theory
- Neville's algorithm
- New Kind of Science or New kind of science
- Newcomb's paradox
- Newform
- Newlander-Niremberg theorem
- Newman-Shanks-Williams number
- Newton and Cotes formulas
- Newton binomial
- Newton interpolation formula
- Newton method
- Newton potential
- Newton's identities
- Newton's iteration
- Newton's method or Newton's Method
- Newton's relations
- Newton-Cotes formulas or Newton-cotes formulas
- Newton-Girard formulas
- Newton-Mercator Series or Newton-Mercator series
- Newton-Raphson Method or Newton-Raphson method or Newton-raphson method or Newton's method
- Neyman-Pearson lemma or Neyman-pearson lemma
- Nibble
- Nicolas Bourbaki or Nicolas bourbaki
- Nicomedes conchoid
- Nicomedes' conchoid
- Nielsen's spiral
- Nielsen-Schreier theorem
- Niemytzki plane
- Nijenhuis bracket
- Nil algebra
- Nil and nilpotent ideals
- Nil geometry
- Nil ideal
- Nil Lie algebra
- Nil manifold
- Nilalgebra
- Nilmanifold
- Nilpotent
- Nilpotent cone
- Nilpotent element
- Nilpotent group
- Nilpotent ideal
- Nilpotent Lie algebra
- Nilpotent Lie group
- Nilpotent matrix
- Nilpotent orbit
- Nilradical
- Nim
- Nim-heap
- Nim-sum
- Nim-value
- Nina Bari
- Nine
- Nine lemma
- Nine-point center
- Nine-point circle
- Niven number
- Niven's constant
- NKS
- No-three-in-a-line-problem
- Node
- Noether formula
- Noether normalization lemma
- Noether problem
- Noether theorem
- Noether's fundamental theorem
- Noether-Lasker theorem
- Noetherian
- Noetherian group
- Noetherian module
- Noetherian ring
- Noetherian scheme
- Noetherian topological space
- Noise
- Noise immunity
- Nome
- Nomogram
- Nomograph
- Nomography
- Non-Abelian or Non-abelian
- Non-abelian group or Non-Abelian group
- Non-archimedean field
- Non-associative algebra
- Non-atomic measure
- Non-central "chi-squared" distribution
- Non-cooperative game
- Non-degenerate bilinear form
- Non-deterministic Turing machine
- Non-Euclidean
- Non-Euclidean geometries or Non-euclidean geometries
- Non-Euclidean geometry or Non-euclidean geometry or Non-Euclidean Geometry
- Non-Euclidean space
- Non-generator
- Non-holonomic systems
- Non-linear dynamics
- Non-linear programming
- Non-measurable set
- Non-orientable manifold
- Non-parametric test
- Non-singular matrix
- Non-standard analysis
- Non-wandering point
- Nonabelian group
- Nonagon
- Nonagonal number
- Nonagram
- Nonassociative algebra
- Noncentral chi-squared distribution
- Noncentral F-distribution
- Noncommutative geometry
- Noncommutative group
- Noncommutative ring
- Noncommutative topology
- Nonconstructive proof
- Noncototient
- Nondecreasing function
- Nondegenerate bilinear form
- Nondeterministic finite state machine or Nondeterministic Finite State Machine
- Nondeterministic Turing machine or Nondeterministic turing machine
- Nonempty set
- Nonessential singularity
- Nonillion
- Nonincreasing function
- Nonlinear programming
- Nonlinear regression
- Nonnegative
- Nonnegative integer
- Nonogram
- Nonparametric estimation
- Nonparametric statistics
- Nonpositive
- Nonsingular matrix
- Nonsingular variety
- Nonstandard Analysis or Nonstandard analysis
- Nonstandard real number
- Nontotient
- Nonwandering
- Nonwandering set
- Nonzero
- NOR or Nor
- Norm
- Norm map
- Normal
- Normal basis theorem
- Normal bundle
- Normal closure
- Normal convergence
- Normal coordinates
- Normal Curve or Normal curve
- Normal derivative
- Normal Distribution or Normal distribution
- Normal epimorphism
- Normal equation
- Normal extension
- Normal family
- Normal Form or Normal form
- Normal form game
- Normal function
- Normal group
- Normal matrix
- Normal monomorphism
- Normal number
- Normal operator
- Normal order
- Normal random variable
- Normal ring
- Normal scheme
- Normal series
- Normal space
- Normal subgroup
- Normal to a plane
- Normal variety
- Normal vector
- Normal-form game
- Normalized vector
- Normalizer
- Normed algebra
- Normed space
- Normed vector space
- North Pole or North pole
- NOT or Not
- Notation
- Novemdecillion
- Nowhere dense
- Nowhere-dense set
- NP-complete or Np-complete or NP-Complete
- Np-complete problem or NP-complete problem
- NP-Hard Problem
- NP-Problem
- Ns
- Nth root
- Nth term test
- Nuclear operator
- Nuclear space
- Nucleus
- Nuisance parameter
- Null function
- Null graph or Null Graph
- Null Hypothesis or Null hypothesis
- Null matrix
- Null set
- Null space
- Null tree
- Null vector
- Nullcline
- Nullity
- Nullspace
- Nullstellensatz
- NUMB3RS or Numb3rs
- Number
- Number axis
- Number field
- Number Field Sieve or Number field sieve
- Number of divisors
- Number of the beast or Number of the Beast
- Number partitioning problem
- Number Place
- Number ring
- Number sign
- Number system
- Number theoretic transform
- Number theory or Number Theory
- Numeral
- Numerator
- Numeric function
- Numerical Analysis or Numerical analysis
- Numerical derivative
- Numerical differentiation
- Numerical Integration or Numerical integration
- Numerical stability
- Numerology
- NURBS curve or Nurbs curve or NURBS Curve
- NURBS surface or Nurbs surface or NURBS Surface
- Nusselt number
- Nybble
- Nyquist criterion
- Nyquist Frequency or Nyquist frequency
- Nyquist limit
- Nyquist sampling
- Néron model or Neron model
- Néron-Severi group
- Nöther
