Mohammed esh Sheikh el Mamun also spelled Muhammad al-Shaykh al-Ma'mun, (b. 1566 – d. 1613) among other transliterations; also known as Abu Abdallah Mohammed III, Arabic: أبو العبدالله محمد سعدي الثالث) was a member of the Saadian dynasty who ruled parts of Morocco during the succession conflicts within the dynasty between 1603 and 1627. He was the son of Sultan Ahmad al-Mansur by one of his harem slave concubines named Elkheizourân (some cite her name as Eldjauher). He was the full-brother of Abu Faris Abdallah and the half-brother of Zidan Abu Maali.