Vladimir Aleksandrovich Ilyin (Russian: Влади́мир Алекса́ндрович Ильи́н; May 2, 1928 – June 26, 2014) was a Soviet and Russian mathematician, Professor at Moscow State University, Doctor of Science, Academician of the Russian Academy of Sciences who made significant contributions to the theory of differential equations, the spectral theory of differential operators, and mathematical modeling.