Abū Ja‘far Abdullāh al-Ma'mūn ibn Hārūn (13. september 786 – 9. august 833) oli Abbassiidide kaliif aastast 813 kuni surmani. On läinud ajalukku kreeka mõttepärandi toetajana islamimaailmas.
Tema isa oli Hārūn ar-Rashīd ja vend Al-Amīn.
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