Fnideq is a town in northern Morocco, on the Mediterranean coast of M'diq-Fnideq Prefecture, 31 kilometres north of the city of Tétouan. The town is also known under the Spanish name Castillejos. It is the closest Moroccan urban commune to the Spanish exclave of Ceuta, although the rural commune of Belyounech is closer. During the Hispano-Moroccan War of 1859, it was the location of the decisive Battle of Castillejos.