Abū Manṣūr Nizār al-Muṣṭafá li-Dīn’il-Lāh (1045-1097) i a Nizāri Ismā‘ilī Imām.

Following the death of his father, Al-Mustansir Billah, he is deposed by his brother, Aḥmad al-Musta‘lī but his son, al-Hādī ibn Nizār, escapes to Alamūt and takes refuge with believers there, thereby continuing the Imāmate.

The followers of Nizār's descendants constitute the majority of the Ismā‘ilī today, with the smaller Musta‘lī branch accepting his younger brother who overthrew him and the Druze ending the Imāmate before either of them.