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

Aschaff
The Aschaff in Aschaffenburg
Location of mouth in Bavaria
Location
Country	Germany
State	Bavaria
Reference no.	DE: 24754
Physical characteristics
Source
• location	near Waldaschaff
• coordinates	49°56′44″N 9°20′01″E / 49.9455°N 9.3337°E / 49.9455; 9.3337
Mouth
• location	near Mainaschaff in the Main
• coordinates	49°58′28″N 9°06′18″E / 49.974526°N 9.104887°E / 49.974526; 9.104887
Length	22.4 km (13.9 mi) [1]
Basin size	166.6 km2 (64.3 sq mi) [1]
Discharge
• average	1.35 m3/s
Basin features
Progression	Main→ Rhine→ North Sea

It is a right tributary of the Main and is 22.4 km (13.9 mi) long. It begins at the Aschaffquelle near Waldaschaff. Loosely translated the name Aschaff means "ash water". The largest tributary is the Laufach. The river flows mostly parallel to the Bundesautobahn 3 (Motorway). For the construction of the noise barrier there, the river bed was moved and straightened.

Now the Aschaff flows in the city of Aschaffenburg. It flows through the districts Damm and Strietwald. In Mainaschaff near the city limits of Aschaffenburg the Aschaff empties into the Main.