Alexandre Joel Chorin (born 25 June 1938) is a University Professor at the University of California, a Professor of Mathematics at the University of California, Berkeley and a Senior Scientist at the Lawrence Berkeley National Laboratory. He is known for his contributions to computational fluid mechanics, turbulence, and computational statistical mechanics.

Chorin received the Ing. Dipl. Physics degree from the Ecole Polytechnique of Lausanne in 1961, an M.S. in Mathematics from New York University in 1964, and a PhD in Mathematics from New York University in 1966.Chorin's awards include the National Academy Award in Applied Mathematics and Numerical Analysis (1989), the Norbert Wiener Prize of the American Mathematical Society and the Society for Industrial and Applied Mathematics (2000),the Lagrange Prize of the International Council on Industrial and Applied Mathematics (2011).In 2014,he received the National Medal of Science.