Abu al-Mahasin Yusuf al-Mustanjid bi'llah (Arabic: أبو المحاسن يوسف المستنجد بالله; died 7 April 1479) was the fourteenth Abbasid caliph of Cairo for the Mamluk Sultanate between 1455 and 1479.
The 1455 mutiny convinced caliph al-Qa'im to abandon his support for Sayf ad-Din Inal and join the uprising.
All mamluks with the exception of the royal guard were removed from their positions in citadel and some of the mutineers were either imprisoned or exiled.
Against the Emirate of (Zulkadir) Turkmen, which is located on the outskirts of the Levant between the countries that owe to the Ottomans and the country under the Mamluks sent a campaign in 876 AH against the Shah of the leader of this emirate, the Sultan Mohammed Al-Fateh supports and supports this Prince of Turkmen, To take over "Entebbe", "Adana" and "Tarsus", Shah Sawar himself was taken to Cairo and he was hanged on the door of Zewailah in 877 AH.
In 877 AH prince Ishbak also led a campaign against the second Turkmen state (the white shah), whose then ruler was Hassan al-Tawil, who raided the suburbs of Aleppo.
Al-Mustansjid died on the 14th of Muharram in 1479 after he was wounded and left sick for two months, and was succeeded by his nephew Al-Mutawakkil II (Abdul Aziz bin Yaqoub).