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- Regular function
- Regular graph
- Regular group
- Regular ideal
- Regular language
- Regular lattice
- Regular linear system
- Regular measure
- Regular open set
- Regular outer measure
- Regular p-group
- Regular polygons
- Regular polyhedra
- Regular prime number
- Regular representation
- Regular ring (in commutative algebra)
- Regular ring (in the sense of von Neumann)
- Regular scheme
- Regular semi-group
- Regular set function
- Regular singular point
- Regular space
- Regular summation methods
- Regular torus
- Regular value
- Regularity criteria
- Regularization
- Regularization method
- Regularization of sequences
- Regulated rewriting
- Regulator of an algebraic number field
- Regulus
- Reidemeister theorem
- Reidemeister torsion
- Reinhardt domain
- Relation
- Relation symbol
- Relative complement
- Relative geometry
- Relative homological algebra
- Relative homology
- Relative metric
- Relative root system
- Relative topology
- Relatively-compact set
- Relatively-open (-closed) set
- Relativistic astrophysics, mathematical problems in
- Relativistic dynamics
- Relativistic hydrodynamics, mathematical problems in
- Relativistic invariance
- Relativistic thermodynamics, mathematical problems in
- Relativity principle
- Relativity theory
- Relaxation method
- Relaxation oscillation
- Relay-contact scheme
- Reliability and inspection of control systems
- Reliability theory
- Reliable computation
- Relief of an analytic function
- Remainder
- Remainder of a space
- Remainder of an integer
- Removable set
- Removable singular point
- Renewal processes
- Renewal theory
- Renormalization
- Renormalization group analysis
- Renyi test
- Repeated integral
- Repeated limit
- Repeated measures
- Repeated series
- Repelling set
- Replica
- Replica of an endomorphism
- Representable functor
- Representation function
- Representation of a Lie algebra
- Representation of a compact group
- Representation of a compact group(2)
- Representation of a group
- Representation of a partially ordered set
- Representation of a semi-group
- Representation of a topological group
- Representation of an associative algebra
- Representation of an infinite group
- Representation of matrices, problem of
- Representation of the classical groups
- Representation of the symmetric groups
- Representation ring
- Representation theory
- Representation with a highest weight vector
- Representative subspace
- Reproducing-kernel Hilbert space
- Reproducing kernel
- Resampling Asymptotics
- Residual mapping
- Residual set
- Residually-finite group
- Residually-finite semi-group
- Residuated mapping
- Residue form
- Residue of an analytic function
- Resolution
- Resolution of singularities
- Resolution of the identity
- Resolvent
- Resolvent set
- Resonance
- Resonance terms
- Restricted direct product
- Restricted predicate calculus
- Restricted quantifier
- Resultant
- Retarded potentials, method of
- Retract
- Retract of a topological space
- Retraction
- Reversible semi-group
- Reynolds number
- Rhombic net
- Rhombus
- Rib of a polyhedron
- Ribaucour congruence
- Ribaucour curve
- Riccati equation
- Ricci curvature
- Ricci identity
- Ricci tensor
- Ricci theorem
- Rice, Stuart Arthur
- Richard paradox
- Richardson extrapolation
- Rickart ring
- Ridge function
- Riedtmann classification
- Riemann-Christoffel tensor
- Riemann-Hilbert problem
- Riemann-Hilbert problem (analytic functions)
- Riemann-Hurwitz formula
- Riemann-Roch theorem
- Riemann-Schwarz principle
- Riemann-Schwarz surface
- Riemann-Stieltjes integral
- Riemann boundary value problem
- Riemann derivative
- Riemann differential equation
- Riemann function
- Riemann geometry
- Riemann hypotheses
- Riemann hypothesis, generalized
- Riemann integral
- Riemann mapping theorem
- Riemann method
- Riemann relation
- Riemann sphere
- Riemann summation method
- Riemann surface
- Riemann surfaces, classification of
- Riemann surfaces, conformal classes of
- Riemann tensor
- Riemann theorem
- Riemann theta-function
- Riemann xi-function
- Riemann zeta-function
- Riemann zeta function
- Riemannian connection
- Riemannian coordinates
- Riemannian curvature
- Riemannian domain
- Riemannian geometry
- Riemannian geometry in the large
- Riemannian manifold
- Riemannian metric
- Riemannian space
- Riemannian space, generalized
- Riemannian space, homogeneous
- Riemann–Christoffel tensor
- Riemann–Hilbert problem
- Riemann–Hilbert problem (analytic functions)
- Riemann–Hurwitz formula
- Riemann–Roch theorem
- Riemann–Schwarz principle
- Riemann–Schwarz surface
- Riemann–Stieltjes integral
- Riesz-Fischer theorem
- Riesz basis
- Riesz convexity theorem
- Riesz decomposition property
- Riesz decomposition theorem
- Riesz inequality
- Riesz interpolation formula
- Riesz operator
- Riesz potential
- Riesz product
- Riesz representation theorem
- Riesz space
- Riesz summation method
- Riesz system
- Riesz theorem
- Riesz theorem(2)
- Riesz–Fischer theorem
- Rigged Hilbert space
- Rigged manifold
- Right-ordered group
- Right group
- Right separated space
- Rigid analytic space
- Rigidity
- Ring
- Ring of polynomials
- Ring of representations
- Ring of sets
- Ring with divided powers
- Ring with division
- Ring with identity
- Ring with operators
- Ringed space
- Ringoid
- Rings and algebras
- Risk of a statistical procedure
- Risk theory
- Ritz method
- Ro-group
- Robbins equation
- Robin constant
- Robin problem
- Robinson-Schensted correspondence
- Robinson test
- Robinson–Schensted correspondence
- Robotics, mathematical problems in
- Robust inference
- Robust statistics
- Rodrigues formula
- Rolle theorem
- Roman numerals
- Romberg method
- Room square
- Root
- Root of unity
- Root system
- Root vector
- Rooted plane tree
- Rooted tree
- Rosenbrock methods
- Roses (curves)
- Rosinger nowhere-dense generalized function algebra
- Rotation
- Rotation indicatrix
- Rotation method
- Rotation number
- Rotation of a vector field
- Rotation surface
- Rotation theorems
- Rotations diagram
- Rotor
- Rotor(2)
- Rouche theorem
- Rouché theorem
- Rough system
- Roulette
- Rounding-off
- Routes to chaos
- Routh-Hurwitz criterion
- Routh theorem
- Routh–Hurwitz criterion
- Row-finite summation method
- Royden, "Real analysis"
- Rudin–Shapiro sequence
- Ruled surface
- Runge-Kutta method
- Runge domain
- Runge rule
- Runge theorem
- Runge–Kutta method
- Runyon number
- Russell paradox
- Rényi test
- S-duality
- S-integer
- SAS
- SBIBD
- SIMD
- SISO system
- SLE
- SOR method
- STS
- Saccheri quadrangle
- Saddle
- Saddle-node bifurcation
- Saddle at infinity
- Saddle node
- Saddle point
- Saddle point in game theory
- Saddle point method
- Saddle surface
- Sahlqvist identities
- Sahlqvist theorem
- Salem number
- Sample
- Sample average
- Sample block
- Sample characteristic
- Sample cluster
- Sample dispersion
- Sample function
- Sample median
- Sample method
- Sample moment
- Sample point
- Sample quantile
- Sample space
- Sample variance
- Sampling from finite populations
- Sampling space
- Santalo formula
- Santaló formula
- Sard theorem
- Sasakian manifold
- Satake compactification
- Satisfiability
- Saxon-Hutner theorem
- Saxon–Hutner theorem
- Scalar
- Scalar curvature
- Scalar field
- Scalar triple product
- Scale-space theory
- Scale parameter
- Scanning method
- Scattered space
- Scattering matrix
- Schar
- Schauder basis
- Schauder method
- Schauder theorem
- Scheduling theory
- Scheme
- Scherk surface
- Schlaefli integral
- Schlicht function
- Schläfli integral
- Schneider method