Oued Laou (Arabic: واد لاو) is a small town located in northern Morocco on the Mediterranean coast.

The two main cities nearby are Tetouan to the northwest and Chefchaouen at the southwest.

The river is 65 km long and its headwaters are located near Bab Bered in the western Rif Mountains; it passes near Chefchaouen before receiving water from its tributaries such as Akchour.

The average flow of the river is 12 m3/s and drains an area of about 1,000 km2.

Oued Laou was mentioned by Pliny the Elder as "flumen Laud" and described it as navigable: flumen Laud et ipsum navigiorum capax (river Laud, which is also navigable for vessels).