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- Tridiagonal matrix
- Trigonalizable element
- Trigonometric functions
- Trigonometric interpolation
- Trigonometric polynomial
- Trigonometric pseudo-spectral methods
- Trigonometric series
- Trigonometric sum
- Trigonometric sums, method of
- Trigonometric system
- Trigonometry
- Trilinear mapping
- Trio
- Triorthogonal system of surfaces
- Triple
- Triple product
- Triple system
- Trisection of an angle
- Trivector
- Trivial order
- Trivial representation
- Trivially ordered set
- Trochoid
- Trotter product formula
- Trotter–Kato theorem
- Trough
- Truncated distribution
- Truth-table reducibility
- Truth table
- Truth value
- Tschirnhausen transformation
- Tsen's theorem
- Tsirelson space
- Tube domain
- Tubular neighbourhood
- Tubular surface
- Tuple
- Turan number
- Turan theory
- Turbulence, mathematical problems in
- Turbulent system
- Turing degree
- Turing machine
- Turing reducibility
- Turán number
- Turán theory
- Tutte matrix
- Tutte polynomial
- Twins
- Two-body problem
- Two-constants theorem
- Two-dimensional annulus
- Two-dimensional cell
- Two-dimensional knot
- Two-dimensional manifold
- Two-dimensional manifold of bounded curvature
- Two-dimensional problems in fracture mechanics
- Two-liquid plasma model
- Two-person zero-sum game
- Two-point tensor
- Two-sheet hyperboloid
- Two-sided estimate
- Two-sided surface
- Two-term congruence
- Two-term equation
- Two-valued logic
- Types, theory of
- Typically-real function
- U-invariant
- U-statistic
- U-test
- UET scheduling
- Ultimately periodic sequence
- Ultra-barrelled space
- Ultra-bornological space
- Ultraconnected topological space
- Ultrafilter
- Ultrametric
- Ultraproduct
- Ultraspherical polynomials
- Umbilical point
- Umbral calculus
- Unary algebra
- Unary operation
- Unavoidable pattern
- Unbiased estimator
- Unbiased test
- Unbounded operator
- Uncertainty principle
- Uncertainty principle, mathematical
- Unconditional convergence
- Unconditional summability
- Uncountable set
- Undecidability
- Underdetermined system
- Undetermined coefficients, method of
- Unicursal curve
- Unified field theories
- Uniform algebra
- Uniform approximation
- Uniform boundedness
- Uniform continuity
- Uniform convergence
- Uniform distribution
- Uniform space
- Uniform stability
- Uniform structure
- Uniform subgroup
- Uniform topology
- Uniformity
- Uniformization
- Uniformizing element
- Uniformly-convergent series
- Uniformly integrable set of random variables
- Uniformly most-powerful test
- Uniformly recurrent word
- Unimodal distribution
- Unimodular element
- Unimodular group
- Unimodular lattice
- Unimodular matrix
- Unimodular transformation
- Union of sets
- Unipotent element
- Unipotent group
- Unipotent matrix
- Unique factorisation domain
- Unique factorization domain
- Uniqueness properties of analytic functions
- Uniqueness set
- Unirational variety
- Uniserial ring
- Unit
- Unit divisor
- Unit element
- Unit matrix
- Unit quaternion
- Unit representation
- Unit vector
- Unital
- Unital algebra
- Unital module
- Unital ring
- Unitarily-equivalent operators
- Unitarily-equivalent representations
- Unitary divisor
- Unitary group
- 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