Wendelin Werner (born 23 September 1968) is a German-born French mathematician. He works on random processes such as self-avoiding random walks, Brownian motion, Schramm–Loewner evolution, and probability theory and mathematical physics. In 2006, he won the Fields Medal "for his contributions to the development of stochastic Loewner evolution, the geometry of two-dimensional Brownian motion, and conformal field theory". He is professor at ETH Zürich.