Immenstädter Horn, Mountain summit in Allgäu Alps, Germany

Immenstädter Horn is a 1,489-meter summit in the Allgäu Alps, the easternmost part of the Prodel ridge chain of Nagelfluh layers. It is made of Nagelfluh conglomerate and lies within the Nagelfluhkette Nature Park. The wooded summit offers no view, but the Kanzel at 1,106 meters provides a good outlook over Immenstadt.

On 22 March 2006 a rockslide on the eastern side of Immenstädter Horn sent roughly 150,000 m³ of debris toward the Steigbachtal, briefly threatening Immenstadt's town centre. The mountain is the easternmost part of the Prodel ridge of the Allgäu Nagelfluh layers and belongs to the international Naturpark Nagelfluhkette project.

Every year in early October, the Hornmesse, a mountain mass, is held at the summit cross, organised by the Immenstadt mountain rescue service and the parish council of Immenstadt-Bühl-Rauhenzell, with music from members of the Bühl brass band. The mountain is also called Gerenstein, or simply Horn, and serves as Immenstadt's local mountain.

Routes start from Immenstadt via the Steigbachtal: to the Kanzel (1,106 m) or Alpe Wildegund (1,315 m) in about 2 hours, via Alpe Alp (1,320 m) in about 2.5 hours, or via the Kemptener Naturfreundehaus (1,450 m) in about 3 hours. From Bühl a path runs over Rieder and Alpe Rabennest to Alpe Kessel (1,243 m) in about 2.5 hours. The summit itself lies in forest, so the view opens from the Kanzel.

The summit lies in forest, so it offers no view; the outlook over Immenstadt opens instead from the Kanzel at 1,106 m, reached by a steep climb from the Steigbachtal. On 22 March 2006 a landslide on the east side sent about 150,000 m³ of debris toward the Steigbachtal, briefly threatening the town centre.