Aitrach is a river of Baden-Württemberg, Germany.

It is formed at the confluence of the Wurzacher Ach and the Eschach near Leutkirch im Allgäu.

It is a left tributary of the Iller, which it joins near the village Aitrach.

Including the Wurzacher Ach, it is 39.6 km long.

This article related to a river in Baden-Württemberg is a stub.