Water tower at the Central Station of Darmstadt, Water tower and event venue near Central Station, Darmstadt, Germany.

The water tower at Darmstadt Central Station is a plastered brick tower built 1910–1912 to designs by railway architect Friedrich Mettegang. Its open steel tank, a hemispherical suspended-bottom container following Georg Barkhausen's principle, carries the wooden structure of the slate roof. The tower also housed signal box IV, operated pneumatically rather than mechanically.

The tower was built between 1910 and 1912 alongside the new Darmstadt main station, to the design of Friedrich Mettegang, a Baurat at the Mainz railway directorate. It supplied water to the station and its locomotives and housed signal box IV, operated pneumatically. The signal box was replaced in 1972 and the tower became obsolete when steam ended in 1975. Scheduled for demolition in 1978, it was listed on 8 August 1978 after citizens noticed the scaffolding; Albrecht Pfohl bought it from the Bundesbahn in 1986 and it was restored in 2003.

The tower's name refers to its role supplying water to the station and its steam locomotives. It also housed signal box IV, operated pneumatically rather than mechanically. Of four such water-tower-signal-box combinations built in Germany, only this one survives as a technical monument. Since 1986 it has belonged to musician, composer and architect Albrecht Pfohl, who bought it from the Deutsche Bundesbahn; a painter's studio now occupies the former boiler room.

The tower stands beside Darmstadt's main station, next to the Dornheimer Brücke. The former boiler room now holds a painter's studio, and the other floors are used for events, so visits depend on what is scheduled there. The site is a protected technical monument, not a regularly opened museum.

The tower is the only surviving German example of a water tower with an integrated signal box, a combination built four times. Its signal box was operated pneumatically rather than mechanically. The musician, composer and architect Albrecht Pfohl bought the tower from the Deutsche Bundesbahn in 1986, saving it from demolition.