Paul Malliavin (French: [maljavɛ̃]; September 10, 1925 – June 3, 2010) was a French mathematician who made important contributions to harmonic analysis and stochastic analysis. He is known for the Malliavin calculus, an infinite dimensional calculus for functionals on the Wiener space and his probabilistic proof of Hörmander's theorem.He was Professor at the Pierre and Marie Curie University and a member of the French Academy of Sciences from 1979 to 2010.