The German mathematician Bernhard Riemann (1826–1866) is the eponym of many things.

- Riemann bilinear relations
- Riemann conditions
- Riemann form
- Riemann function
- Riemann–Hurwitz formula
- Riemann matrix
- Riemann operator
- Riemann singularity theorem
- Riemann surface
- Cauchy–Riemann manifold
- Zariski–Riemann space

- Cauchy–Riemann equations
- Riemann integral
- Riemann invariant
- Riemann mapping theorem
- Riemann problem
- Riemann solver
- Riemann sphere
- Riemann–Hilbert correspondence
- Riemann–Hilbert problem
- Riemann–Lebesgue lemma
- Riemann–Liouville integral
- Riemann–Roch theorem
- Riemann–Stieltjes integral
- Riemann series theorem
- Riemann sum

- Riemann–von Mangoldt formula
- Riemann hypothesis
- Riemann theta function
- Riemann Xi function
- Riemann zeta function
- Riemann–Siegel formula
- Riemann–Siegel theta function

- Free Riemann gas also called primon gas
- Riemann invariant
- Riemann–Cartan geometry
- Riemann–Silberstein vector
- Riemann-Lebovitz formulation
- Riemann curvature tensor also called Riemann tensor
- Riemann tensor (general relativity)

- Pseudo-Riemannian manifold
- Riemannian bundle metric
- Riemannian circle
- Riemannian cobordism
- Riemannian connection
- Riemannian connection on a surface
- Riemannian cubic
- Riemannian cubic polynomials
- Riemannian foliation
- Riemannian geometry
- Riemannian graph
- Riemannian group
- Riemannian holonomy
- Riemannian manifold also called Riemannian space
- Riemannian metric tensor
- Riemannian Penrose inequality
- Riemannian polyhedron
- Riemannian singular value decomposition
- Riemannian submanifold
- Riemannian submersion
- Riemannian volume form
- Riemannian wavefield extrapolation
- Sub-Riemannian manifold
- Riemannian symmetric space