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- Unitary matrix
- Unitary module
- Unitary operator
- Unitary representation
- Unitary space
- Unitary transformation
- Univalency conditions
- Univalency radius
- Univalent function
- Universal Turing machine
- Universal algebra
- Universal algorithm
- Universal behaviour in dynamical systems
- Universal covering
- Universal enveloping algebra
- Universal function
- Universal invariant
- Universal invariant of a field
- Universal normal algorithm
- Universal problems
- Universal property
- Universal quadratic form
- Universal quantifier
- Universal quantor
- Universal series
- Universal set
- Universal space
- Universally measurable
- Universe
- Unoid
- Unordered pair
- Unramified character
- Unramified ideal
- Unrectifiable set
- Unsolvability
- Upper-and-lower-functions method
- Upper and lower bounds
- Upper and lower limits
- Upper bound of a family of topologies
- Upper central series
- Upper radical
- Urelement
- Urn model
- Urysohn-Brouwer lemma
- Urysohn equation
- Urysohn lemma
- Urysohn metrization theorem
- Urysohn space
- Urysohn–Brouwer lemma
- Utility theory
- VMO-space
- VMOA-space
- Vague topology
- Valuation
- Value-distribution theory
- Valued function field
- Van der Pol equation
- Van der Waerden conjecture
- Van der Waerden test
- Van der Waerden theorem
- Vandermonde determinant
- Vanishing cycle
- Vapnik-Chervonenkis class
- Vapnik-Chervonenkis dimension
- Vapnik–Chervonenkis class
- Vapnik–Chervonenkis dimension
- Variable-directions method
- Variable-grid method
- Variance
- Variation
- Variation-parametric method
- Variation of Hodge structure
- Variation of a function
- Variation of a functional
- Variation of a mapping
- Variation of a set
- Variation of a univalent function
- Variation of constants
- Variational calculus
- Variational calculus, numerical methods of
- Variational calculus in the large
- Variational equations
- Variational inequalities
- Variational numerical methods
- Variational principles (in complex function theory)
- Variational principles of classical mechanics
- Variational problem
- Variational series
- Variety in a category
- Variety of groups
- Variety of rings
- Variety of semi-groups
- Variety of universal algebras
- Varignon parallelogram
- Varignon theorem
- Vaughan identity
- Vaught conjecture
- Vector
- Vector algebra
- Vector analysis
- Vector autoregressive models
- Vector axiomatics
- Vector bundle
- Vector bundle, algebraic
- Vector bundle, analytic
- Vector calculus
- Vector field
- Vector field, source of a
- Vector field on a manifold
- Vector function
- Vector functions, algebra of
- Vector group
- Vector lattice
- Vector measure
- Vector product
- Vector ring
- Vector space
- Vector tube
- Vector valued measure
- Vekua method
- Venn, John
- Venn diagram
- Verbal congruence
- Verbal product
- Verbal subgroup
- Verhulst–Pearl logistic process
- Verification
- Veronese mapping
- Versor
- Vertex algebra
- Vertex operator
- Vertex operator algebra
- Vertor
- Vicinal pre-order
- Viete theorem
- Vietoris-Begle theorem
- Vietoris homology
- Vietoris topology
- Vietoris–Begle theorem
- Vinogradov-Goldbach theorem
- Vinogradov estimates
- Vinogradov hypotheses
- Vinogradov integral
- Vinogradov method
- Vinogradov theorem about the average
- Vinogradov–Goldbach theorem
- Virasoro algebra
- Virial decomposition
- Virial theorem
- Virtual displacements, principle of
- Virtually-asymptotic net
- Viscosity
- Viscosity solutions
- Viscous fingering
- Vitali-Hahn-Saks theorem
- Vitali set
- Vitali theorem
- Vitali variation
- Vitali–Hahn–Saks theorem
- Viviani curve
- Vizing theorem
- Viète theorem
- Vladimirov method
- Vladimirov variational principle
- Vlasov-Maxwell equation
- Vlasov-Poisson-Fokker-Planck system
- Vlasov kinetic equation
- Vlasov–Maxwell equation
- Vlasov–Poisson–Fokker–Planck system
- Volterra-Stieltjes integral equation
- Volterra equation
- Volterra functional series
- Volterra kernel
- Volterra operator
- Volterra series
- Volterra–Stieltjes integral equation
- Volume
- Volume form
- Von Karman equations
- Von Karman vortex shedding
- Von Kármán equations
- Von Kármán vortex shedding
- Von Mises distribution
- Von Neumann algebra
- Von Neumann entropy
- Von Neumann ergodic theorem
- Von Neumann–Morgenstern solution
- Von Staudt-Clausen theorem
- Von Staudt–Clausen theorem
- Voronoi diagram
- Voronoi lattice types
- Voronoi summation method
- Vortical ring
- Voss net
- Voss surface
- Voting paradoxes
- W-distribution
- WCG space
- WKBJ approximation
- WKB method
- WLS
- W 1+inf-algebra
- Wagner–Preston theorem
- Wald identity
- Walker, Francis Amasa
- Wall group
- Wall invariant
- Wallis formula
- Wallman compactification
- Walsh-Paley system
- Walsh functions
- Walsh series
- Walsh system
- Walsh–Paley system
- Wandering point
- Wandering set
- Ward theorem
- Waring-Goldbach problem
- Waring identity
- Waring problem
- Waring–Goldbach problem
- Wasserstein metric
- Watson lemma
- Watson transform
- Wave equation
- Wave front
- Wave vector
- Wavelet analysis
- Waves
- Way below
- Weak P-point
- Weak convergence of probability measures
- Weak derivative
- Weak extremum
- Weak homology
- Weak homotopy equivalence
- Weak order
- Weak relative minimum
- Weak singularity
- Weak solution
- Weak topology
- Weakly-wandering set
- Weakly infinite-dimensional space
- Web
- Web differentiation
- Web of spheres
- Weber equation
- Weber function
- Weber problem
- Webs, geometry of
- Wedderburn-Artin theorem
- Wedderburn-Mal'tsev theorem
- Wedderburn–Artin theorem
- Wedderburn–Mal'tsev theorem
- Wedge
- Wedge (in a vector space)
- Weibull distribution
- Weierstrass-Erdmann corner conditions
- Weierstrass E-function
- Weierstrass conditions (for a variational extremum)
- Weierstrass coordinates
- Weierstrass criterion
- Weierstrass criterion (for uniform convergence)
- Weierstrass elliptic functions
- Weierstrass formula
- Weierstrass p-function
- Weierstrass point
- Weierstrass preparation theorem
- Weierstrass representation of a minimal surface
- Weierstrass ring
- Weierstrass sigma-function
- Weierstrass theorem
- Weierstrass transform
- Weierstrass zeta-function
- Weierstrass–Erdmann corner conditions
- Weight
- Weight function
- Weight of a representation of a Lie algebra
- Weight of a topological space
- Weight space
- Weighted algebra
- Weighted average
- Weighted space
- Weil-Chatelet group
- Weil-Châtelet group
- Weil-Petersson metric
- Weil algebra
- Weil algebra of a Lie algebra
- Weil bundle
- Weil cohomology
- Weil domain
- Weil–Châtelet group
- Weil–Petersson metric
- Weingarten derivational formulas
- Weingarten surface
- Weldon, Walter Frank Raphael
- Well-founded relation
- Well-ordered set
- Well-ordering theorem
- Well-posed problem
- Well-powered category
- Weyl-Kac character formula
- Weyl-Otsuki space
- Weyl algebra
- Weyl almost-periodic functions
- Weyl calculus
- Weyl connection
- Weyl correspondence
- Weyl criterion
- Weyl group
- Weyl method
- Weyl module
- Weyl problem
- Weyl quantization
- Weyl sum
- Weyl tensor
- Weyl theorem
- Weyl–Kac character formula
- Weyl–Otsuki space
- White noise
- White noise analysis
- Whitehead group
- Whitehead homomorphism
- Whitehead module
- Whitehead multiplication
- Whitehead problem
- Whitehead product
- Whitehead test module
- Whitehead torsion
- Whitham equations
- Whitney-Graustein theorem
- Whitney class
- Whitney decomposition
- Whitney extension theorem
- Whitney mapping
- Whitney–Graustein theorem
- Whittaker equation
- Whittaker functions
- Whittaker transform
- Wick product
- Width
- Width of a partially ordered set
- Wielandt subgroup
- Wiener-Hopf equation
- Wiener-Hopf method