Abū al-Fiḍā’ ‘Imād ad-Dīn Ismā‘īl ibn ‘Umar ibn Kathīr al-Qurashī al-Damishqī (Arabic: إسماعيل بن عمر بن كثير القرشي الدمشقي أبو الفداء عماد; c. 1300 – 1373), known as Ibn Kathīr (ابن كثير, was a highly influential Arab historian, exegete and scholar during the Mamluk era in Syria. An expert on tafsir (Quranic exegesis) and fiqh (jurisprudence), he wrote several books, including a fourteen-volume universal history titled Al-Bidaya wa'l-Nihaya.

His tafsir is recognized for its critical approach to Israʼiliyyat, especially among Western Muslims and Wahhabi scholars. His methodology largely derives from his teacher Ibn Taymiyyah, and differs from that of other earlier renowned exegetes such as Tabari. For that reason, he is mostly considered an Athari, despite being a Shafi'i jurist.