| Fnideq | |
| Native Name: | Arabic: الفنيدق |
| Pushpin Map: | Morocco#Africa |
| Pushpin Relief: | 1 |
| Pushpin Label Position: | bottom |
| Pushpin Mapsize: | 300 |
| Pushpin Map Caption: | Location in Morocco |
| Subdivision Type: | Country |
| Subdivision Name: | Morocco |
| Subdivision Type1: | Region |
| Subdivision Name1: | Tanger-Tetouan-Al Hoceima |
| Subdivision Type2: | Prefecture |
| Subdivision Name2: | M'diq-Fnideq |
| Unit Pref: | Imperial |
| Population As Of: | September 2014 |
| Population Footnotes: | [1] |
| Population Total: | 77436 |
| Population Blank1 Title: | Ethnicities |
| Timezone: | CET |
| Utc Offset: | +1 |
| Coordinates: | 35.85°N -26°W |
Fnideq (Arabic: الفنيدق) is a town in northern Morocco, on the Mediterranean coast of M'diq-Fnideq Prefecture, 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.