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- Thue-Mahler equation
- Thue-Morse sequence
- Thue-Siegel-Roth theorem
- Thue method
- Thue semi-system
- Thue system
- Thue–Mahler equation
- Thue–Morse sequence
- Thue–Siegel–Roth theorem
- Tie
- Tight and taut immersions
- Tight measure
- Tightness
- Tightness of a topological space
- Tikhonov-Phillips regularization
- Tikhonov cube
- Tikhonov product
- Tikhonov space
- Tikhonov theorem
- Tikhonov–Phillips regularization
- Tiling
- Tiling/def
- Tilted algebra
- Tilting functor
- Tilting module
- Tilting theory
- Time-optimal control problem
- Time series
- Tissot equation
- Titchmarsh-Weyl m-function
- Titchmarsh convolution theorem
- Titchmarsh problem
- Tits building
- Tits bundle
- Tits quadratic form
- Tits system
- Toda lattices
- Todd class
- Todd polynomials
- Toeplitz C*-algebra
- Toeplitz form, indefinite
- Toeplitz matrix
- Toeplitz operator
- Toeplitz system
- Tolerance
- Tolerance intervals
- Tomita-Takesaki theory
- Tomita–Takesaki theory
- Tomography
- Tonelli-Cesari variation
- Tonelli plane variation
- Tonelli theorem
- Topological algebra
- Topological dynamical system
- Topological dynamics
- Topological entropy
- Topological equivalence
- Topological field
- Topological group
- Topological invariant
- Topological module
- Topological product
- Topological ring
- Topological semi-group
- Topological space
- Topological structure (topology)
- Topological structures
- Topological tensor product
- Topological transitivity
- Topological vector space
- Topologically complete space
- Topologized category
- Topology, general
- Topology of compact convergence
- Topology of imbeddings
- Topology of manifolds
- Topology of uniform convergence
- Topos
- Torelli theorems
- Toricelli point
- Toroidal coordinates
- Toroidal harmonics
- Torricelli point
- Torse
- Torsion
- Torsion-free group
- Torsion-free module
- Torsion form
- Torsion group
- Torsion submodule
- Torsion tensor
- Torus
- Torus knot
- Total derivative
- Total increment
- Total order
- Total positivity
- Total set
- Total variation of a function
- Total variation of a measure
- Totally-additive function
- Totally-bounded set
- Totally-bounded space
- Totally-disconnected space
- Totally-geodesic manifold
- Totally-imperfect space
- Totally-irreducible set
- Totally-normal space
- Totally multiplicative function
- Totally ordered group
- Totally ordered set
- Totally separated space
- Totally well-ordered set
- Totient function
- Tournament
- Tower of fields
- Trace
- Trace of a square matrix
- Trace on a C*-algebra
- Tractrix
- Train algebra
- Train track
- Trajectory
- Transcendency, measure of
- Transcendental branch point
- Transcendental curve
- Transcendental extension
- Transcendental function
- Transcendental number
- Transfer function
- Transfer principle
- Transference theorem in Diophantine approximation
- Transfinite diameter
- Transfinite induction
- Transfinite number
- Transfinite recursion
- Transfinite sequence
- Transformation
- Transformation group
- Transformation semi-group
- Transgression
- Transition-operator semi-group
- Transition function
- Transition probabilities
- Transition with prohibitions
- Transitive group
- Transitive relation
- Transitive set
- Transitivity
- Translation
- Translation-invariant metric
- Translation of programs
- Translation surface
- Translations of semi-groups
- Translativity of a summation method
- Transmission, condition of
- Transmission rate of a channel
- Transport equations, numerical methods
- Transport net
- Transport problem
- Transport surface
- Transportation problem
- Transpose
- Transpose matrix
- Transposed equations
- Transposed matrix
- Transposed relation
- Transposition
- Transvection
- Transversal elliptic operator
- Transversal mapping
- Transversal system
- Transversality
- Transversality condition
- Trapezium
- Trapezium formula
- Travelling-tube method
- Travelling-wave method
- Travelling salesman problem
- Tree
- Trefftz method
- Triad
- Triads
- Triangle
- Triangle, defect of a
- Triangle centre
- Triangular array
- Triangular element
- Triangular group
- Triangular matrix
- Triangular norm
- Triangular number
- Triangular summation method
- Triangulation
- Tribonacci number
- Tribonacci sequence
- Tricomi equation
- Tricomi problem
- 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