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- Hausdorff–Young inequalities
- Heaps and semi-heaps
- Heat content asymptotics
- Heat equation
- Heaviside function
- Heavy sphere, method of the
- Hebb rule
- Hecke operator
- Hedetniemi conjecture
- Heegaard decomposition
- Heegaard diagram
- Height, in Diophantine geometry
- Height, in elementary geometry
- Height of an ideal
- Heine-Borel theorem
- Heine–Borel theorem
- Heinz-Kato-Furuta inequality
- Heinz-Kato inequality
- Heinz inequality
- Heinz–Kato inequality
- Heinz–Kato–Furuta inequality
- Heisenberg representation
- Helical calculus
- Helical line
- Helicoid
- Hellinger distance
- Hellinger integral
- Helly's theorem
- Helly number
- Helly theorem
- Helmholtz equation
- Help
- Henkin construction
- Hensel lemma
- Hensel ring
- Henselian
- Henselization of a valued field
- Hereditarily indecomposable continuum
- Herglotz formula
- Hermann algorithms
- Hermite equation
- Hermite function
- Hermite identity
- Hermite interpolation formula
- Hermite polynomials
- Hermite problem
- Hermite transform
- Hermitian connection
- Hermitian form
- Hermitian kernel
- Hermitian matrix
- Hermitian metric
- Hermitian operator
- Hermitian structure
- Hermitian symmetric space
- Heron formula
- Heron triangle
- Hertz principle
- Hessian (algebraic curve)
- Hessian matrix
- Hessian of a function
- Heteroclinic point
- Hewitt realcompactification
- Hexahedron
- Heyman lemma
- Heyting algebra
- Heyting formal system
- Hida calculus
- Hierarchical clustering
- Hierarchy
- Higher-dimensional category
- Higher-dimensional geometry
- Highest common factor
- Hilbert's 2nd problem
- Hilbert-Euler problem
- Hilbert-Kamke problem
- Hilbert-Schmidt integral operator
- Hilbert-Schmidt norm
- Hilbert-Schmidt operator
- Hilbert-Schmidt series
- Hilbert 2nd problem
- Hilbert algebra
- Hilbert cube
- Hilbert function
- Hilbert geometry
- Hilbert inequality
- Hilbert infinite hotel
- Hilbert invariant integral
- Hilbert kernel
- Hilbert polynomial
- Hilbert problems
- Hilbert program
- Hilbert scheme
- Hilbert singular integral
- Hilbert space
- Hilbert space with an indefinite metric
- Hilbert system of axioms
- Hilbert syzygy theorem
- Hilbert theorem
- Hilbert theory of integral equations
- Hilbert transform
- Hilbert–Bramble lemma
- Hilbert–Euler problem
- Hilbert–Kamke problem
- Hilbert–Schmidt integral operator
- Hilbert–Schmidt norm
- Hilbert–Schmidt operator
- Hilbert–Schmidt series
- Hill, Austin Bradford
- Hill equation
- Hille-Tamarkin operator
- Hille–Tamarkin operator
- Histogram
- Hit-or-miss topology
- Hitchin system
- Hodge conjecture
- Hodge structure
- Hodge theorem
- Hodge variety
- Hodgkin-Huxley system
- Hodgkin–Huxley system
- Hodograph
- Hodograph transform
- Hoeffding decomposition
- Holder condition
- Holder inequality
- Holder space
- Holder summation methods
- Holley inequality
- Holographic proof
- Holomorph of a group
- Holomorphic envelope
- Holomorphic form
- Holomorphic function
- Holomorphic mapping
- Holomorphically-convex complex space
- Holomorphy, criteria for
- Holonomic system
- Holonomy group
- Homeomorphism
- Homeomorphism group
- Homfly polynomial
- Homoclinic bifurcations
- Homoclinic point
- Homogeneous bounded domain
- Homogeneous complex manifold
- Homogeneous convex cone
- Homogeneous coordinates
- Homogeneous function
- Homogeneous operator
- Homogeneous space
- Homogeneous space of an algebraic group
- Homogroup
- Homological algebra
- Homological classification of rings
- Homological containment
- Homological dimension
- Homological dimension of a space
- Homological perturbation theory
- Homology
- Homology base
- Homology functor
- Homology group
- Homology manifold
- Homology of a complex
- Homology of a dynamical system
- Homology of a polyhedron
- Homology product
- Homology sequence
- Homology theory
- Homology with compact support
- Homomorphism
- Homoscedasticity
- Homothety
- Homotopically-trivial mapping
- Homotopy
- Homotopy coherence
- Homotopy group
- Homotopy polynomial
- Homotopy type
- Homotopy type of a topological category
- Hooke law
- Hopf-Rinow theorem
- Hopf-Tsuji-Sullivan theorem
- Hopf algebra
- Hopf alternative
- Hopf bifurcation
- Hopf fibration
- Hopf group
- Hopf invariant
- Hopf manifold
- Hopf order
- Hopf orders, applications of
- Hopf ring
- Hopf–Rinow theorem
- Hopf–Tsuji–Sullivan theorem
- Horizontal distribution
- Horn clauses, theory of
- Horner scheme
- Horocycle
- Horocycle flow
- Horosphere
- Hotelling, Harold
- Hotelling-T^2-distribution
- Hotelling test
- Hough transformation
- HowTo EoM
- Howell design
- Huffman code
- Hulthen potential
- Hunt-Stein theorem
- Hunt–Stein theorem
- Hurst, Harold Edwin
- Hurwitz criterion
- Hurwitz equation
- Hurwitz formula
- Hurwitz number
- Hurwitz theorem
- Hurwitz transformation
- Hurwitz zeta function
- Hutchinson equation
- Huygens, Christiaan
- Huygens principle
- Hydrodynamic approximation
- Hydrodynamics, mathematical problems in
- Hydrogen-like atom
- Hyers-Ulam-Rassias stability
- Hyers–Ulam–Rassias stability
- Hyper-elliptic curve
- Hyper-elliptic integral
- Hyperbola
- Hyperbolic cross
- Hyperbolic cylinder
- Hyperbolic functions
- Hyperbolic geometry
- Hyperbolic group
- Hyperbolic metric
- Hyperbolic metric, principle of the
- Hyperbolic paraboloid
- Hyperbolic partial differential equation
- Hyperbolic partial differential equation, numerical methods
- Hyperbolic point
- Hyperbolic set
- Hyperbolic spiral
- Hyperbolic trigonometry
- Hyperbolicity
- Hyperboloid
- Hypercentre
- Hypercomplex functions
- Hypercomplex number
- Hyperconnected topological space
- Hypercontractive semi-group
- Hypercycle
- Hypereffective estimator
- Hyperfunction
- Hypergeometric distribution
- Hypergeometric equation
- Hypergeometric function
- Hypergeometric series
- Hypergraph
- Hypergroups, harmonic analysis on locally compact
- Hyperhomology functor
- Hyperimmune set
- Hyperplane
- Hyperrelaxation method
- Hyperspace
- Hypersurface
- Hypo-Dirichlet algebra
- Hypocycloid
- Hypotenuse
- Hypotrochoid
- Hysteresis
- Hysteron
- Hölder condition
- Hölder inequality
- Hölder space
- Hölder summation methods
- Icosahedral space
- Icosahedron
- Ideal
- Ideal number
- Ideal point
- Ideal series
- Idele
- Idempotence
- Idempotent
- Idempotent algorithm
- Idempotent analysis
- Idempotent correspondence principle
- Idempotent semi-ring
- Idempotent superposition principle
- Idempotents, semi-group of
- Identical truth
- Identity element
- Identity map
- Identity matrix
- Identity problem
- Idèle
- Ill-posed problems
- Ill-posed problems in complex function theory
- Illative combinatory logic
- Illumination problem
- Image of a morphism
- Imaginary number
- Imaginary unit
- Imbedded word
- Imbedding of categories
- Imbedding of function spaces
- Imbedding of rings
- Imbedding of semi-groups
- Imbedding theorems
- Imbedding theorems for Orlicz-Sobolev spaces
- Imbedding theorems for Orlicz–Sobolev spaces
- Immanant
- Immediate extension
- Immersion
- Immersion of a manifold
- Immersion operation
- Immune set
- Implication
- Implicative normal form
- Implicative propositional calculus
- Implicit function
- Implicit function (in algebraic geometry)
- Implicit operator
- Impossible event
- Imprimitive group
- Improper distribution
- Improper integral
- Imputation
- Inaccessible cardinal
- Incentre
- Incidence
- Incidence calculus
- Incidence coefficient
- Incidence matrix
- Incidence structure
- Incidence system
- Inclined line
- Inclusion-and-exclusion principle
- Inclusion-exclusion formula
- Inclusion of summation methods
- Incommensurable quantities
- Incomplete beta-function
- Incomplete data in clinical and epidemiological studies