Paul Monsky (born June 17, 1936) is an American mathematician and professor at Brandeis University.
After earning a Bachelors degree from Swarthmore College, he received his Ph. D. in 1962 from the University of Chicago under the supervision of Walter Bailey. He has introduced the Monsky-Washnitzer cohomology and he has worked intensively on Hilbert-Kunz functions and Hilbert-Kunz multiplicity. In 2007, Monsky and Brenner gave an example showing that tight closure does not commute with localization.