Eugene Borisovich Dynkin (; May 11, 1924 – 14 November 2014) was a Soviet-American mathematician. He worked most in probability and algebra. Dynkin especially worked in semisimple Lie groups, Lie algebras, and Markov processes. The Dynkin diagram, the Dynkin system, and Dynkin's lemma are named for him. Before his death, Dynkin was a mathematician at Cornell University.