Aurach (also: Mittlere Aurach) is a river of Bavaria, Germany. It is a tributary of the river Regnitz.
The river Aurach begins in the Franconian Heights to the west of the village Klausaurach in the municipality of Markt Erlbach. It runs through Aurachtal, the town of Herzogenaurach, and the Erlangen district of Frauenaurach. After crossing under the Main-Danube Canal, it joins the river Regnitz at the Erlangen district of Erlangen-Bruck.
A recreational cycle path runs alongside the river Aurach from Herzogenaurach to Erlangen.
