The Wattenbach or Wattenerbach is a river of Tyrol, Austria, a tributary of the Inn.

The rivers Mölsbach and Lizumbach merge in the valley bottom near Lager Walchen at a height of 1,410 m (AA) thus forming the origin of the Wattenbach.

It then flows from the Wattentaler Lizum almost due north through the Wattental valley.

The small village Wattenberg diverts their wastewater into the sewage works of Fritzens.

Several constructed defence structures have also successfully been avoiding high water.