Dhünn is a 40 km (25 mi)-long river located in North Rhine-Westphalia, Germany.

Its main source is near Wipperfürth in the Bergisches Land area.

It runs in a south-westerly direction, and its mouth into the river Wupper is near Leverkusen, appr.

This means that the 24 km (15 mi)-long stretch of the river from the mouth into the Wupper to the 'Großen Dhünn' dam is accessible without obstacles for fish and microbes.

This article related to a river in North Rhine-Westphalia is a stub.