The Innbach is a river in Upper Austria with a length of approximately 53 km (33 mi). Its source is near Gaspoltshofen at the foot of the Hausruck hills and empties into the Danube at Wilhering. Its drainage basin covers 196 km² (76 sq mi). After Gaspoltshofen, the Innbach passes the towns of Kematen am Innbach, Pichl bei Wels and Bad Schallerbach, at the mouth of the Trattnach.