Gérard Ben Arous (born 26 June 1957) is a French mathematician, specializing in stochastic analysis and its applications to mathematical physics.

From 1997 to 2007, Ben Arous was a professor of applied probability theory at the École Polytechnique Fédérale de Lausanne, where he held the chair of Stochastic Modeling and founded the Bernoulli Institute in 2001.

In 1996 he gave a plenary lecture Large deviations as a common probabilistic tool for some problems of analysis, geometry and physics at the European Congress of Mathematicians in Budapest.

In 2002 he was an invited speaker at the International Congress of Mathematicians (ICM) in Beijing and gave a talk Aging and Spin Glass Dynamics.

[3] His doctoral students include Antonio Auffinger, Raphaël Cerf, Ivan Corwin, Alice Guionnet, Houman Owhadi and Sandrine Péché.