David Nualart (born 21 March 1951) is a Spanish mathematician working in the field of probability theory, in particular on aspects of stochastic processes and stochastic analysis. He obtained his PhD titled "Contribución al estudio de la integral estocástica" in 1975 at the University of Barcelona under the supervision of Francesc d'Assís Sales Vallès.After positions at the University of Barcelona and the Polytechnique University of Barcelona he took up a professorship at the University of Kansas and is currently the Black-Babcock Distinguished Professor in its Mathematics Department.