Ronald C. D. Breslow (born March 14, 1931) is an American chemist from Rahway, New Jersey. He is currently University Professor at Columbia University, where he is based in the Department of Chemistry and affiliated with the Departments of Biological Sciences and Pharmacology; he has also been on the faculty of its Department of Chemical Engineering. He has taught at Columbia since 1956 and is a former chair of the university's chemistry department.He won Perkin Medal in 2010.