The Inaouen River is a watercourse in Morocco. It is a tributary of the Sebou River. The river rises in the Middle Atlas mountain range. A major dam, the Idriss I, was constructed on the Inaouen in 1973.
In the upper parts of the watershed within the Middle Atlas is the prehistoric range of the endangered primate Barbary macaque, which prehistorically had a much larger range in North Africa.