Badis ibn Mansur (Arabic: باديس بن منصور) was a short‑reigned sultan of the Hammadid Sultanate in North Africa. He succeeded his father al‑Mansur ibn Buluggin and ruled from January 1105 until his death on 27 July 1105 (13 Dhu al‑Qaʿda 498 AH). His reign lasted approximately seven months.
During his brief rule Badis was described by contemporary chroniclers as a violent and reckless ruler, earning comparisons to the Roman emperor Caligula. Notable actions attributed to him include the expropriation and execution of his father’s vizier, Abd Al‑Karim bin Sulayman; the disgrace of the governor of Qalʿat Beni Hammad after Badis relocated to Béjaïa; and the exile of his brother Abd al‑Aziz, then governor of Algiers, to Jijel.
Badis’s rule ended with his death in July 1105, after which he was succeeded by his brother Abd al‑Aziz ibn Mansur. His short reign is documented in the historical record of the Hammadid dynasty, which governed parts of present‑day Algeria from the 11th to the 12th centuries.