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Sonnenborgh Observatory (Dutch: Museum Sterrenwacht Sonnenborgh; Sonnenborgh museum & sterrenwacht; obs. code: 015) is an astronomical observatory and museum open to the public, located in Utrecht, Netherlands. It was founded in 1853 as a university observatory (of the University of Utrecht) and from 1854 until 1897 it was the first home of the Royal Dutch Meteorological Institute. After the meteorological institute moved to de Bilt it was operated again by Utrecht University. In 2013 its main function became a museum, organising viewing evenings for amateur astronomists. It is located on, what is now, the only surviving bastion of the city walls of Utrecht.
In 2021, The European Physical Society (EPS) named it as an official EPS Historic Site.