Alain-Sol Sznitman (born December 13, 1955) is a French mathematician who works as a professor of mathematics at ETH Zurich. His research concerns probability theory and mathematical physics.
Sznitman did his undergraduate studies at the École Normale Supérieure, and earned a Doctorat d'Etat in 1983 from Pierre and Marie Curie University, under the supervision of Jacques Neveu. He worked at the Courant Institute of Mathematical Sciences at New York University beginning in 1983 and was promoted to full professor there in 1990. He moved to ETH Zurich in 1991, and from 1995 to 1999 was director of the Institute for Mathematical Research at ETH Zurich.
In 1991, Sznitman won the Rollo Davidson Prize, given annually to an early-career probabilist, and in 1999 he won the Line and Michel Loève International Prize in Probability. He became a fellow of the Institute of Mathematical Statistics in 1997, and of the American Mathematical Society in 2012. He was an invited speaker at the International Congress of Mathematicians in 1998.