Sergey Ivanovich Belyavsky (Russian: Серге́й Ива́нович Беля́вский; December 7, 1883 (Julian calendar: November 25) – October 13, 1953) was a Soviet/Russian astronomer and a discoverer of 36 numbered minor planets.
[1] His last name is also alternatively spelled Beljavskij (name under which the Minor Planet Center credits him) or Beljawskij.
He was born in St. Petersburg and was a member of the Academy of Sciences of the Soviet Union.
His field of work included astrophotometry, astrometry, and the study of variable stars.
Between 1937 and 1944, Belyavsky was the seventh director of the Pulkovo Observatory, where he succeeded Boris Gerasimovich.