Uthman ibn Naissa (Arabic: عثمان بن نيساء), better known as Munuza, was a Berber governor (wali) who established an independent power base in Cerdanya on the eastern Pyrenees (in modern-day southern France) around 731 CE, breaking away from the Umayyad Caliphate. He was the wali of Narbonne and Cerdagne, in addition to the Spanish territory of Catalonia. To solidify his position, he formed an alliance with the Duke of Aquitaine, Odo the Great, and married his daughter Lampegia. He was eventually defeated by the Umayyad forces of Abd al-Rahman ibn Abd Allah al-Ghafiqi. Munuza's defeat was followed by Umayyad forces turning their attention to Odo, which led to the Umayyad victory at the Battle of the River Garonne.
Munuza is depicted in different contradictory chronicles during the Muslim conquest of the Iberian Peninsula. He is also possibly the same man as the governor of León and/or Gijón defeated by Pelagius in the late 710s/early 720s. Munuza is also believed to have been a companion of the Berber leader Tariq ibn Ziyad.