Fiodar Fiodaraŭ, (Belarusian : Фёдар Іванавіч Фёдараў, Fiodar Ivanavič Fiodaraŭ, Russian: Фёдор Иванович Фёдоров, Fedor Ivanovich Fedorov), (June 19, 1911 – October 13, 1994) was a Soviet and Belarusian physicist, whose scientific interests ranged from optics and spectroscopy to the theory of elementary particles.