Remplin Observatory, Public observatory in Malchin, Germany.

Remplin Observatory is a 14-metre tower with a fixed dome in the park of Remplin, Malchin. It is the oldest surviving observatory building in Mecklenburg, built in 1793 as a two-storey observatory in the garden house of Remplin Palace and given its massive tower in 1801. The tower was restored from 1980 by members of the Archenhold Observatory's astronomy history group.

Friedrich II von Hahn, who had studied mathematics and astronomy in Kiel, set up a two-storey observatory in the garden house at Remplin in 1793. In 1801 a massive 14-metre tower with a rotating dome, known as the Ochsenturm, was added. After Hahn's death in 1805 the instruments went partly to Königsberg and Basedow, and the main building was demolished in 1857. The tower was badly damaged by artillery fire on 30 April 1945 and later by vandalism; restoration began in 1980.

The tower is known locally as the "Ochsenturm". From Remplin, Friedrich von Hahn discovered the faint central star of the Ring Nebula (Messier 57) in 1800. His observations appeared from 1794 in Johann Elert Bode's Astronomische Jahrbücher. The site is now cared for by the Förderverein der Sternwarte Remplin.

The site is open to visitors who can participate in programs about celestial events and telescopic observations. Plan enough time to explore not only the observatory but also the other buildings on the estate and the surrounding park.

The tower is the oldest surviving observatory building in Mecklenburg. From Remplin, Friedrich II von Hahn discovered the faint central star of the Ring Nebula (Messier 57) in 1800. After his death in 1805 the instruments went partly to Königsberg; the Cary circle is now in the Deutsches Museum.