The Sebou (Berber: Asif en Sbu, Arabic: سبو) is a river in northern Morocco.

Pliny the Elder states that it was "magnificus et navigabilis" (grand and navigable), flowing near the towns of Banasa (near the city of Mechra Bel Ksiri) and Thamusida.

[2][3] There is scant historical reference to the Sebou being used for navigation after the Islamic conquest; nevertheless, its river mouth was an important harbor and shipyard in the Almohad period.

In 1669–1670, the Alaouite sultan Moulay Rashid built a bridge over the river near Fes which has been preserved today.

In the first years of the French protectorate an expedition successfully navigated the Sebou from Sidi Ali Ben Sliman to the city of Fez on a small steam boat Le Dantec.