Badis ibn Mansur () was briefly the ruler of the Hammadids in 1105.
Badis was described as an extremely violent leader despite his short reign (7 months) ; He is said to be extremely reckless and to be a sort of "Mini Caligula". He expropriated and killed his father's vizier, Abd Al Karim bin Sulayman. When he left the Qal'a Beni Hammad to live in Bejaia, he disgraced the governor of the latter. He also exiled his brother Abd al-Aziz, then governor of Algiers, to Jijel. He died on 13 Dhu al Qa'da 498 AH, corresponding to 27 July 1105.