Blankenbach is a small river of Bavaria, Germany.

It is a left tributary of the Kahl in the district Aschaffenburg of the Bavarian Spessart.

Originally Blankenbach means as much as blinking brook.

It runs through a ravine in a north-westerly direction to Kleinblankenbach (a community of Blankenbach).

In front of the sports field it flows into a piping.