Muhammad ibn Shu'ayb al Zarkun

Muhammad ibn Shu'ayb al-Zarkun, known as Zerkounes (Greek: Ζερκουνῆς) in the Byzantine sources, was the fourth Emir of Crete.

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 second emir, Shu'ayb, and the grandson of the conqueror of Crete and founder of the Emirate of Crete, Abu Hafs Umar. He is believed to have reigned from ca. 895 to ca. 910, succeeding his brother Umar.