Fatimah bint Hizam al-Qilabiyya (died 64 A.H. (683/684) or 69 A.H. (688/689)), commonly known as Umm ul-Banin ("mother of several sons"), was from the tribe of Banu Kalb.
She married Ali ibn Abi Talib after the death of his first wife Fatimah, daughter of the Islamic prophet, Muhammad. Umm ul-Banin and Ali had four sons, of whom the eldest was Abbas ibn Ali, the commander of Husayn ibn Ali's forces at the Battle of Karbala. Shimr ibn Dhi 'l-Jawshan, who later killed Husayn ibn Ali at the battle, was from the same tribe as Umm ul-Banin, and he offered safe-conduct to her and her sons before the battle commenced; however, they rejected it since the offer did not include Husayn. All of Umm ul-Banin's sons were killed at Karbala.