Al-Muhtasib al-Mujahid Hamzah (died 2 November 1067) was an imam of the Zaidi state in Yemen who ruled from 1060 to 1067.
Much of Yemen was dominated by the powerful Sulayhid king Ali as-Sulayhi, who ruled San'a and the land south of it by 1063.
The title muhtasib meant that he was only imam in the sense of protector of the community, but was not entitled to lead the public prayers or pass legal sentences.
[1] His chance seemed to come in 1067, when Ali as-Sulayhi was assaulted and killed by the Najahid ruler Sa'id bin Najah from Zabid.
Al-Muhtasib al-Mujahid Hamzah immediately grabbed the opportunity and attacked San'a with 500 cavalry and 15,000 infantry, mainly tribesmen of Hamdan.