Abū al-Faraj Muḥammad ibn Isḥāq an-Nadīm, also Ibn Abī Yaʿqūb Isḥāq ibn Muḥammad ibn Isḥāq al-Warrāq, and commonly known by the nasab (patronymic) Ibn an-Nadīm, was a Muslim bibliographer and biographer of Baghdad who compiled the encyclopedia Kitāb al-Fihrist.

The Kitāb al-Fihrist is a compendium of the knowledge and literature of tenth-century Islam compiled by Ibn al-Nadim (d.998). It references approx. 10,000 books and 2,000 authors. This crucial source of medieval Arabic-Islamic literature, informed by various ancient Hellenic and Roman civilizations, preserves from his own hand the names of authors, books and accounts otherwise entirely lost. Al-Fihrist is evidence of Ibn al-Nadim's thirst for knowledge among the exciting sophisticated milieu of Baghdad's intellectual elite. As a record of civilisation transmitted through Muslim culture to the Western world, it provides unique classical material and links to other civilisations.