Don Malcolm Blasius (born 5 September 1950 in Paterson, New Jersey) is an American mathematician.
Blasius graduated from Harvard University in 1972 with a bachelor's degree and from the University of Oxford in 1977 with a bachelor's degree.
He received his PhD in 1981 from Princeton University with thesis Arithmetic of Monomial Relations between the Periods of Abelian Varieties under the supervision of Goro Shimura.
Blasius was an assistant professor from 1981 to 1985 at Columbia University and from 1985 to 1987 at Yale University.