The Hornbach chain (German: Hornbachkette) is a string of mountains, about 15 kilometres long, in the Allgäu Alps in the Austrian state of Tyrol.
The Hornbach chain branches at the Öfnerspitze from the main line of the Allgäu Alps and runs in a gentle arc from north to east.
In the far west, it branches at the Hornbachspitze and a side ridge runs southwards in which the most important peak of the whole chain, the Großer Krottenkopf (2,656 m) is located.
In the west the range is bounded along this side branch by a line that reaches from Holzgau in the south, runs along the Höhenbachtal and Rossgumpental valleys to the Öfnerkar in the north.
On the main ridge of the Hornbach chain, the highest peaks are the Marchspitze (2,609 m), the Bretterspitze (2,608 m) and the Urbeleskarspitze (2,632 m), which are all in the ten most important summits of the Allgäu Alps.