Abū Naṣr Manṣūr b. ʿIrāq was a famous Persian mathematician and astronomer of the 4th/10th and 5th/11th century and a member of either the Āl ʿIrāq or the ancient Kh^wārazm-Shāh dynasty.

Even though Abū Naṣr was quite well known both in his time and later because of his mathematical work, biographers and historians rarely mentioned him. The little information available on him is based on the scattered and often contradictory reports that Niẓāmī ʿArūḍī, al-Subkī and Abū Rayḥān al-Bīrūnī give abou…