The Kißlegg–Hergatz railway is an 18.589 km long standard gauge main line that runs through the Allgäu in the German states of Baden-Württemberg and Bavaria.

It is operated by Deutsche Bahn and is listed in its timetable as part of route number 753 from Aulendorf to Hergatz, which is alternatively called the Württemberg-Allgäu-Bahn (Allgäu-Württemberg Railway) and part of route number 971 from Augsburg to Lindau.

The Kißlegg–Wangen section is integrated in the network of the Bodensee-Oberschwaben Verkehrsverbund (Lake Constance-Upper Swabia Transport Association, bodo).

[4] In 2020, three pairs of Eurocity services hauled by class 218 locomotives ran from Munich to Zurich (some to/from Basel) via Memmingen and Lindau without stopping.

Since 13 December 2020, all EC services between Munich and Zurich, six pairs of trains per day each way, have been operated by SBB electric multiple units.