Bismarck Tower, Memorial tower in Kassel, Germany.

The Bismarck Tower is a stone observation tower built from basalt and tuff that stands 25.5 meters tall on a hill near Kassel. The structure offers views across the city and the surrounding Kassel Basin from its upper level.

The tower was built between 1903 and 1904 to a design by architect Wilhelm Kreis, following his 'Götterdämmerung' type used for 47 Bismarck towers. Foundation work began in 1903, construction started on 15 February 1904, and the tower was inaugurated on 2 September 1904, Sedantag. It was later damaged by lightning on 28 May 1962 and closed for repairs from 2008 to 2010.

The tower is one of 47 Bismarck towers built to Wilhelm Kreis's "Götterdämmerung" design, and at 25.5 metres it is the tallest of that type. It was inaugurated on 2 September 1904, Sedantag, a date tied to the German victory at Sedan in 1870.

The tower stands about 70 meters south-southeast of the Brasselsberg summit in the Habichtswald Nature Park. Inside, 120 steps lead to the observation platform at 456.3 meters above sea level; the stairway was replaced with stainless steel in 2010. The tower was closed from mid-2008 to mid-October 2010 due to severe damage to the stairs.

On clear days, visitors can see distant mountains like the Brocken and Hohe Meißner from the summit, landmarks that normally lie beyond typical viewing distances. This extended view makes the tower's location special for long-range sightlines across the surrounding region.