The Midou(French pronunciation: [midu]; Occitan: Midor) or Midour is the left precursor of the Midouze, in the Southwest of France.

The Midou rises in Armagnac, in the Gers département.

It joins the Douze in Mont-de-Marsan to constitute the Midouze, a tributary of the Adour.

It is considered the upper course of the Midouze by Sandre.

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