The Ziller is an approximately 47 km long right-sie tributary to the Inn River, in the Zillertal in Tyrol, Austria. It springs from the ridge of the Zillertal Alps, and feeds the hydropower plant Speicher Zillergründl. In Mayrhofen it receives the Zemmbach (that in turn receives the Tuxerbach). By Zell am Ziller it receives the Gerlosbach, before it flows into the Inn by Strass im Zillertal.