Johan August Hugo Gyldén (Helsinki May 29, 1841 – Stockholm November 9, 1896) was a Finland-Swedish astronomer.
Gyldén was the son of Nils Abraham Gyldén, Professor of Classical philology at the University of Helsinki and spent his student years at that university, graduating as a filosofie magister from the Faculty of Physics and Mathematics in 1860. In 1871 he was called by the Royal Swedish Academy of Sciences to be its astronomer and head of the Stockholm Observatory.
He worked on celestial mechanics studying the stability of orbits over long periods.
The Gyldén crater on the Moon is named after him.
O. Backlund, “Hugo Gyldén.” Monthly Notices of the Royal Astronomical Society 57: 222–224 (1897)
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