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- Pseudo-tensor
- Pseudo-vector
- Pseudo algebraically closed field
- Psi-function
- Psi-ring
- Ptolemeus theorem
- Puiseux series
- Pullback
- Pure subgroup
- Pure submodule
- Purely inseparable extension
- Purely unrectifiable set
- Pursuit game
- Pushout
- Putnam-Fuglede theorems
- Putnam–Fuglede theorems
- Pyramid
- Pyramid schemes
- Pythagoras' theorem
- Pythagoras number
- Pythagoras theorem
- Pythagorean closure
- Pythagorean field
- Pythagorean numbers
- Pythagorean theorem
- Pythagorean theorem, multi-dimensional
- Pythagorean triple
- Péclet number
- Pólya distribution
- Pólya theorem
- QAC
- Quadrangle
- Quadrangle, complete
- Quadrant
- Quadratic closure
- Quadratic deviation
- Quadratic differential
- Quadratic equation
- Quadratic error
- Quadratic field
- Quadratic form
- Quadratic forms, reduction of
- Quadratic irrationality
- Quadratic mean
- Quadratic module
- Quadratic non-residue
- Quadratic programming
- Quadratic reciprocity law
- Quadratic residue
- Quadratic space
- Quadratic surface forms
- Quadratically closed field
- Quadratrix
- Quadratrix of Hippias
- Quadrature
- Quadrature-sum method
- Quadrature formula
- Quadrature formula of highest algebraic accuracy
- Quadrature of the circle
- Quadric
- Quadrilateral
- Qualitative theory of differential equations
- Qualitative theory of differential equations in Banach spaces
- Quantale
- Quantifier
- Quantile
- Quantity
- Quantum Grassmannian
- Quantum Turing machine
- Quantum communication channel
- Quantum computation, theory of
- Quantum field theory
- Quantum field theory, axioms for
- Quantum groups
- Quantum homogeneous space
- Quantum information processing, science of
- Quantum probability
- Quantum sphere
- Quantum stochastic processes
- Quartile
- Quasi-Abelian function
- Quasi-Boolean space
- Quasi-Euclidean space
- Quasi-Frobenius ring
- Quasi-Newton method
- Quasi-affine scheme
- Quasi-algebraically closed field
- Quasi-analytic class
- Quasi-averages, method of
- Quasi-character
- Quasi-classical approximation
- Quasi-coherent sheaf
- Quasi-compact space
- Quasi-conformal mapping
- Quasi-cyclic group
- Quasi-dihedral group
- Quasi-discrete spectrum
- Quasi-elliptic space
- Quasi-equivalent representations
- Quasi-geodesic line
- Quasi-group
- Quasi-hyperbolic space
- Quasi-identity
- Quasi-informational extension
- Quasi-invariant measure
- Quasi-isometric spaces
- Quasi-isometry
- Quasi-linear equation
- Quasi-linear hyperbolic equations and systems
- Quasi-linearization
- Quasi-metric
- Quasi-norm
- Quasi-normal space
- Quasi-normed space
- Quasi-periodic function
- Quasi-periodic motion
- Quasi-prime number
- Quasi-projective scheme
- Quasi-regular mapping
- Quasi-regular radical
- Quasi-regular ring
- Quasi-scalar matrix
- Quasi-simple representation
- Quasi-solution
- Quasi-split group
- Quasi-symmetric function
- Quasi-symmetric function of a complex variable
- Quasi-symplectic space
- Quasi-triangular Hopf algebra
- Quasi-uniform convergence
- Quasi-variety
- Quaternary form
- Quaternary quadratic form
- Quaternion
- Quaternion algebra
- Quaternion group
- Quaternionic structure
- Quenching
- Quetelet, Adolphe
- Queue
- Queue, multi-channel with waiting
- Queue input stream of calls
- Queue with priorities
- Queue with refusals
- Queue with waiting and one service channel
- Queueing theory
- Queueing theory (Statprob)
- Quiver
- Quizmaster problem
- Quotient category
- Quotient group
- Quotient mapping
- Quotient object
- Quotient representation
- Quotient ring
- Quotient space
- R-group
- Raabe criterion
- Rabinowitsch trick
- Racah-Wigner coefficients
- Radau quadrature formula
- Rademacher system
- Rademacher theorem
- Radial basis function
- Radial boundary value
- Radian
- Radiation conditions
- Radiative transfer theory
- Radical
- Radical axis
- Radical in a class of semi-groups
- Radical of a group
- Radical of an ideal
- Radical of rings and algebras
- Radius
- Radius of convergence
- Radius vector
- Radon-Nikodym decomposition
- Radon-Nikodym property
- Radon-Nikodym theorem
- Radon-Nikodým theorem
- Radon integral
- Radon measure
- Radon space
- Radon transform
- Radon–Nikodým theorem
- Ramanujan function
- Ramanujan hypothesis
- Ramanujan sums
- Ramification theory of valued fields
- Ramified prime ideal
- Ramsey number
- Ramsey theorem
- Random allocation
- Random and pseudo-random numbers
- Random coding
- Random coefficient models
- Random element
- Random event
- Random field
- Random field, generalized
- Random field, homogeneous
- Random field (Statprob)
- Random function
- Random mapping
- Random matrix
- Random sequence
- Random variable
- Random variables, transformations of
- Random walk
- Random walk (Statprob)
- Randomization
- Randomization test
- Range (of variation of a sample)
- Range of values
- Rank
- Rank of a Lie algebra
- Rank of a Lie group
- Rank of a group
- Rank of a module
- Rank of a partially ordered set
- Rank of a singular point
- Rank of an algebraic group
- Rank of an ordinary linear differential equation
- Rank statistic
- Rank sum test
- Rank test
- Rank vector
- Ranked poset
- Rao-Blackwell-Kolmogorov theorem
- Rao-Cramer inequality
- Rao-Cramér inequality
- Rao–Blackwell–Kolmogorov theorem
- Rao–Cramér inequality
- Rare events analysis
- Rate of convergence
- Rational curve
- Rational function
- Rational homotopy theory
- Rational mapping
- Rational number
- Rational representation
- Rational singularity
- Rational surface
- Rational tangles
- Rational variety
- Rationality theorems
- Ravine function
- Ray
- Ray-Knight compactification
- Ray class group
- Ray function
- Ray method
- Rayleigh-Faber-Krahn inequality
- Rayleigh-Taylor instability
- Rayleigh distribution
- Rayleigh equation
- Rayleigh–Faber–Krahn inequality
- Rayleigh–Taylor instability
- Ray–Knight compactification
- Reaction-diffusion equation
- Real-analytic space
- Real-closed field
- Real algebraic variety
- Real analytic function
- Real closed field
- Real function
- Real norm
- Real number
- Real valued measure
- Realizability
- Reciprocal equation
- Reciprocity laws
- Recognition problem
- Rectangle
- Rectangle rule
- Rectifiable curve
- Rectifiable set
- Rectifiable varifold
- Rectifying plane
- Recurrence relation
- Recurrent events
- Recurrent formula
- Recurrent function
- Recurrent point
- Recurrent relation
- Recurrent word
- Recursion
- Recursions of higher degrees
- Recursive definition
- Recursive equivalence type
- Recursive estimation
- Recursive function
- Recursive game
- Recursive model theory
- Recursive operator
- Recursive predicate
- Recursive realizability
- Recursive relation
- Recursive sequence
- Recursive set theory
- Reduced norm
- Reduced normal form
- Reduced residue system
- Reduced scheme
- Reduced system of residues
- Reduced trace
- Reducibility axiom
- Reducible Riemannian space
- Reducible linear system
- Reducible representation
- Reductio ad absurdum
- Reductive group
- Reductive space
- Redundancy
- Rees semi-group of matrix type
- Refal
- Reference system
- Refinement
- Reflection
- Reflection group
- Reflection of an object of a category
- Reflection principle
- Reflective subcategory
- Reflector
- Reflexive space
- Reflexive subcategory
- Reflexivity
- Refutable formula
- Regression
- Regression analysis
- Regression coefficient
- Regression matrix
- Regression spectrum
- Regression surface
- Regular Borel measure
- Regular algebra
- Regular automorphism
- Regular boundary point
- Regular cardinal
- Regular closed set
- Regular element
- Regular event
- Regular expression
- Regular extremal