Abū al-ʽAbbās Aḥmad ibn Muḥammad ibn ʽIḏārī al-Marrākushī (أبو العباس أحمد ابن عذاري المراكشي) was the late-13th/early-14th century author of Al-Bayan al-Mughrib, an important medieval text on the history of the Maghreb (North Africa) and Al-Andalus (now the Iberian Peninsula) written in 1312.
Ibn Idhāri was born in and lived in Marrakech, (now in Morocco), and was a qāʾid (commander) of Fez, but little is known of his life. He cites his works (now lost) about the caliphs, imāms and amīrs across the Islamic world. His surviving work, Al-Bayan al-Mughrib, which contains the history of Ifriqiya from the conquest of Miṣr in 640/1 AD to the Almohad conquests in 1205/6 AD, is valued by modern researchers for information not found elsewhere, and extracts from older works now lost. These include reports of the first Viking raids on Al-Andalus in the ninth century.