Abū Isḥāq Ibrāhīm ibn Aḥmad, better known by his regnal name al-Wāthiq (I) bi-'llāh, was the fourth Abbasid caliph of Cairo under the Mamluk Sultanate. He was installed by Mamluk sultan an-Nasir Muhammad, reigning for almost an year from 1340 to 1341, against al-Hakim II, the designated heir of the previous caliph al-Mustakfi I.
- Position held
- Abbasid caliph
- Born
- 1290
