Abūʾl-Maymūn ʿAbd al-Majīd ibn Muḥammad ibn al-Mustanṣir, better known by his regnal name as al-Ḥāfiẓ li-Dīn Allāh, was the eleventh Fatimid caliph, ruling over Egypt from 1132 to his death in 1149, and the 21st imam of Hafizi Isma'ilism.

Hafizi Isma'ilism was a branch of Musta'li Isma'ilism that emerged as a result of a split in 1132. The Hafizis accepted the Fatimid caliph Abd al-Majid al-Hafiz li-Din Allah and his successors as imams, while the rival Tayyibi branch rejected them as usurpers, favouring the succession of the imamate along the line of al-Hafiz's nephew, al-Tayyib.