Hinterhornbach is a municipality in the district of Reutte in the Austrian state of Tyrol.

Hinterhornbach lies in the Hornbach valley, a side valley of the Lech watershed. It is situated at the foot of the Hochvogel in the Allgau Alps.

The municipality of Hinterhornbach consists of the following populated place (with a population in brackets as of 1 January 2022): the village of Hinterhornbach (93); alongside a few farmsteads called 'rotte' being Krummenstein and Pretterhof.