Keith Martin Ball (born 26 December 1960) is a mathematician and professor at the University of Warwick.

[9] Keith Ball's research is in the fields of functional analysis, high-dimensional and discrete geometry and information theory.

His Royal Society citation reads Keith Ball is an exceptionally original mathematician whose work has had a major influence on two branches of mathematics: functional analysis and information theory.

He produced a sharp version of the Banach-Steinhaus Theorem conjectured in the 50s, and proved that infinitely many values of the Riemann function at odd integers are irrational (with Rivoal).

(With Artstein, Barthe and Naor) he answered a fundamental question in information theory by showing that the central limit theorem of probability is driven by an analogue of the second law of thermodynamics.