Abu'l-Ghana'im Muslim ibn Mahmud al-Shayzari

Amīn al-Dīn Abu ʾl-Ghanāʾim Muslim ibn Maḥmūd al-Shayzarī ( 1201–1225) was a Syrian-born Yemeni adīb and astronomer.

Al-Shayzarī was born in Damascus into prominent family of mamālīk in the service of Usāma ibn Munqidh, lord of Shayzar in Syria. His father was still living in 1169. Al-Shayzarī later moved to the court of al-Muʿizz Ismāʿīl ibn Ṭughtigīn ((r. 1197 – 1201)), Ayyubid governor of Yemen. He dedicated to him an anthology of adab in twenty-five chapters, ʿAjāʾib al-ashʿār wa-gharāʾib al-akhbār, of which a single medieval manuscript is preserved, dated 1291 and now in Peshawar. In 1225, he composed another anthology in sixteen books, Jamharat al-Islām dhāt al-nathr wa ʾl-niẓām, for the Ayyubid governor al-Masʿūd Ṣalāḥ al-Dīn Yūsuf ((r. 1215 – 1229)). He included poems by himself and his son Aḥmad. The Jamharat is preserved in a single manuscript dated 1298 and now in Leiden. A second work dedicated to al-Masʿūd is the ʿĀdāt al-nujūm, known from a manuscript copied in 1665 or 1666 and now in Ṣanʿāʾ. It is an astronomical almanac similar to the Calendar of Córdoba. It was not compiled for use in Yemen.

Al-Shayzarī's date of death is unknown.