Al-Malik al-Mas‘ūd Ṣalāḥ al-Dīn Abū al-Muẓaffar Yūsuf ibn Muḥammad (Arabic: الملك المسعود صلاح الدين أبو المظفر يوسف بن محمد; 1201–1229) was the sixth and final Ayyubid ruler of Yemen, from 1215 to 1229.
Jo Van Steenbergen (2016). Caliphate and Kingship in a Fifteenth-Century Literary History of Muslim Leadership and Pilgrimage. Bibliotheca Maqriziana. Vol.4. A critical edition, annotated translation, and study of al-Maqrīzī's al-Dhahab al-Masbūk. Leiden: Brill. pp.330–335. doi:10.1163/9789004332362. ISBN9789004332362.