Fedor Dmitriyevich Klement (30.05.1903-28.06.1973) was a Soviet physicist and an academician of the Academy of Sciences of the Estonian SSR (1951). He was born in St Petersburg. He graduated from Leningrad University (1934). In 1935 — 53 he worked at the Research Physical Institute of Leningrad University, in 1951 — 70 he was rector of Tartu University, and in 1954—60 and 1971—73 he worked at the Institute of Physics and Astronomy of the Academy of Sciences of the Estonian SSR.
His research concerned the luminescence of solids, the spectroscopy of solids, the conditions under which crystal phosphors arise, the physics of ionic crystals and the history of science. He discovered (1935) and studied an important variety of phosphors — the sublimate phosphors.
Hero of Socialist Labour (1969).