Vil Sultanovich Mirzayanov (Russian: Вил Султанович Мирзаянов, Tatar: Вил Солтан улы Мирзаҗанов; born 9 March 1935 in Starokangyshevo, Dyurtyulinsky District, Bashkortostan) is a Russian chemist of ethnic Tatar origin who now lives in the United States, best known for revealing secret chemical weapons experimentation in Russia.