The Aschaff (in its uppermost course: Kleinaschaff) is a river in the northern Spessart in Bavaria, Germany.

Loosely translated the name Aschaff means "ash water".

For the construction of the noise barrier there, the river bed was moved and straightened.

In Mainaschaff near the city limits of Aschaffenburg the Aschaff empties into the Main.

This article related to a river in Bavaria is a stub.