Wilhelm-Foerster-Sternwarte, Public observatory at Insulaner hill in Schöneberg, Germany.

The Wilhelm-Foerster-Sternwarte is a public observatory located on Insulaner hill in Schöneberg and welcomes visitors to observe celestial objects through its telescopes. The facility houses several instruments including a large refractor telescope capable of magnifications up to 700 times.

Hans Mühle and Hans Rechlin founded the Wilhelm-Foerster-Institut on 15 October 1947, with the Allied Kommandantur's trade licence as its official founding act; Richard Sommer, a pupil of Wilhelm Foerster, chose the name. The first site was the ruined casino at General-Pape-Straße 2 in Schöneberg, fitted with a 40-seat lecture room and two observation platforms. The foundation stone on the Insulaner was laid in November 1961 and the new building opened on 30 January 1963.

The name honours Wilhelm Foerster, chosen by his student Richard Sommer, who led the Zoo station planetarium and the Archenhold Observatory. Since 1953 the site has been run by the Wilhelm-Foerster-Sternwarte e.V., founded on 8 June 1953, whose members and volunteers give talks and guided tours for school classes, continuing a practice begun in the ruins on General-Pape-Straße.

The facility sits on a hill with good viewing conditions and maintains regular hours for visitors to observe. Cloud cover can occasionally close the observatory, so checking ahead before your visit is worth doing.

The Bamberg refractor, nicknamed "Bambi", was moved from the ruined Urania building on Invalidenstrasse in January 1951 and set up on the Insulaner in 1955. In 1966 it received a mobile observing staircase weighing 718 kg, which cost 3344 marks.