Großer Krottenkopf, Mountain peak in Hinterhornbach, Austria.

Großer Krottenkopf is a mountain summit in the Allgäu Alps standing at 2,656 meters, part of the Hornbach Chain. The peak is approached via different routes, with the main path combining hiking with a simple climbing section.

The sources record no first-ascent date, climber or naming act for the Großer Krottenkopf. Its documented history is one of route development: the Kemptner Hut at 1,844 m serves as the northern base for the normal route over the Oberer Mädelejoch and Krottenkopfscharte, while the north arête offers a UIAA grade III climb reached from the Hermannskarscharte.

The name Krottenkopf is shared with the Krottenspitzen, the rocky points of the Hornbach chain from which the massif rises. The peak stands on the border above the Oberes Mädelejoch, so walkers on the E5 long-distance path between Oberstdorf and Holzgau pass beneath it. The Simms Waterfall snack bar in the Höhenbachtal is a customary stop on the Lech side.

The normal route from the Kemptner Hut (1,844 m) crosses the Oberer Mädelejoch (2,033 m) on the German-Austrian border, then follows red dots over scree and stone-covered slabs to the Krottenkopfscharte (2,350 m) and the summit in just under three hours. Sure-footedness is needed throughout and a head for heights near the top; the climbing is UIAA grade I. From Holzgau (1,103 m) the E5 path via the Simms Waterfall and Untere Roßgumpenalpe takes just under four hours.

The normal route crosses the Oberer Mädelejoch, the state border between Germany and Austria at 2,033 m, before reaching the Krottenkopfscharte at 2,350 m. From there, numerous red dots mark the way over scree-covered slabs to the summit. The final stretch is a UIAA grade I climb, so sure-footedness and a head for heights are needed near the top.