Al-Ḥasan ibn ʿAmmār al-Kalbī,[1] usually called simply Ibn Ammar in the Arabic sources,[2][3] was an Arab commander for the Fatimid Caliphate. A member of the Kalbid family, he was active in the wars with the Byzantine Empire in Sicily in the 960s, leading the capture of Taormina and Rometta, which completed the Muslim conquest of Sicily.
Some scholars identify him with "Abu Muhammad al-Hasan ibn Ali", also known as Ibn Ammar, a leader of the Kutama Berbers and chief minister (wāsiṭa) during the first year of the reign of the Fatimid Caliph al-Hakim bi-Amr Allah (r. 996–1021), but this is disputed.