Wendelin Werner (born 23 September 1968) is a German-born French mathematician working on random processes such as self-avoiding random walks, Brownian motion, Schramm–Loewner evolution, and related theories in probability theory and mathematical physics.

In 2006, at the 25th International Congress of Mathematicians in Madrid, Spain he received the Fields Medal "for his contributions to the development of stochastic Loewner evolution, the geometry of two-dimensional Brownian motion, and conformal field theory".

[1] After a classe préparatoire at Lycée Hoche in Versailles, he studied at École Normale Supérieure from 1987 to 1991.

His 1993 doctorate was written at the Université Pierre-et-Marie-Curie and supervised by Jean-François Le Gall.

Werner was a researcher at the CNRS (National Center of Scientific Research, Centre national de la recherche scientifique) from 1991 to 1997, during which he also held a two-year Leibniz Fellowship, at the University of Cambridge.