Ali ibn Yusuf ibn Umar

{{Short description|The sixth Emir of Crete}}

Ali ibn Yusuf ibn Umar ({{langx|ar|علي بن يوسف بن عمر}}) was the sixth emir of Crete, reigning from {{circa|915–925}}.

The surviving records on the internal history and rulers of the Emirate of Crete are very fragmentary. He is tentatively identified as a son of the fifth emir, Yusuf, and the great-grandson of the conqueror of Crete and founder of the emirate, Abu Hafs Umar. He is believed to have reigned from {{circa|915}} to {{circa|925}}, succeeding his father.{{sfn|Miles|1964|pp=11–15}}{{sfn|Canard|1971|p=1085}}{{sfn|PmbZ|loc=ʻAlī b. Yūsuf II. (#20257)}}

He is probably the unnamed emir of Crete mentioned in a story about the abduction of a number of prisoners from Nauplion by Cretan pirates {{circa|920}}; the bishop Peter of Argos prayed for their deliverance, and an Imperial galley caught the pirates, immobilized them with Greek fire, and returned the captives to their homes.{{sfn|PmbZ|loc=ʻAlī b. Yūsuf II. (#20257)}} His name is only attested through coinage.{{sfn|Miles|1964|pp=13, 15}}

He was succeeded by his uncle, Ahmad ibn Umar.{{sfn|Miles|1964|p=13}}{{sfn|Canard|1971|p=1085}}