Al-Ma'mun may refer to:
- al-Ma'mun (786–833), a 9th-century Abbasid Caliph
- Ma'mun I ibn Muhammad (died 997), Khwarazmshah
- Ma'mun II (died 1017), Khwarazmshah
- al-Ma'mun al-Bata'ihi (died 1125), vizier to the Fatimid caliph al-Amir bi-Ahkami'l-Lah.
- al-Mamun of Toledo (died 1075), Taifa king and a member of the Banu Dil-Nun dynasty.
- Idris al-Ma'mun (died 1232), claimant to the Almohad caliphate
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