Bismarck Tower, Observation tower in the Steigerwald, Erfurt, Germany

Bismarck Tower is a 22-metre tower on the Am Tannenwäldchen path in the Steigerwald forest on the southern edge of Erfurt. It was built to the design "Götterdämmerung" by Dresden architect Wilhelm Kreis, a plan reused for Bismarck towers in other German cities. The tower is a protected monument, overgrown with young trees and fenced off because of falling debris.

The Bismarcksäulen-Verein was founded in Erfurt on 23 March 1900 to collect donations for a Bismarck tower. The tower, designed by Dresden architect Wilhelm Kreis after his "Götterdämmerung" plan, opened on 1 September 1901. Bismarck had a personal link to the city: he sat in the 1850 Erfurt Union Parliament and hiked through the Steigerwald. The city has owned the tower since 1904.

The tower follows Wilhelm Kreis's 1901 design "Götterdämmerung", a standard plan reused for Bismarck towers in other German cities. Its name changed to Friedensturm in the GDR era, and a restaurant stands beside it today. A memorial on the Riechheimer Berg, erected in 1907 and rededicated in 1995, is a separate Bismarck monument in Erfurt.

The structure is currently not open to the public due to safety concerns regarding its condition. Visitors can view the monument from the outside and explore the surrounding area.

The tower was not demolished in the GDR, unlike many other Bismarck towers; it was kept because of its good position as a lookout over the city forest and only renamed Friedensturm. After 1999 the Bismarckturm-Verein 1900 e.V. made it climbable again, but since the association became inactive around 2015 it has stood fenced off, overgrown with young trees.