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The Msha’sha’iya (Arabic: المشعشعية, also transliterated as Musha'sha) were a Shi'a sect founded and led by Muhammad ibn Falah, an Iraqi-born theologian who believed himself to the earthly representative of Imam Ali and the Mahdi. From the middle of the 15th century to the 19th century, they came to dominate much of western Khuzestan, a province in southwestern Iran.

Beginning in 1436, ibn Falah spread his messianic beliefs amongst the less powerful Arab tribes along the area of the present-day border of Iraq and Iran, gaining converts in an attempt to forge a strong tribal alliance ^[1]. In 1441 they succeeded in capturing the city of Hoveizeh in Khuzestan, and during the following ten years the Msha'sha'iya increased their strength and consolidated their power in the area around the city and the Tigris river. These early military ambitions were fueled by Muhammad ibn Falah's zealous millenarian theology, which continued to significantly influence the later military campaigns of the Msha'sha'iya decades after his death.

Successors of ibn Falah were in continual conflict with the Safavid rulers as well as with Iranian Arab tribes until overcome by the Safavids in 1508 ^[2]. The conflict with the Safavids was driven not only by politics and territorial domination, but also by theological differences and competition between two rival Shi'a schools of thought. According to Moojan Momen, both sects adhered to heterodox (ghuluww) Shi'a beliefs^[3].

According to Shi'a eschatology, the Mahdi will appear at the end times to lead the forces of good, who will be based in Iran, to struggle against the forces of evil, who will be based in Syria and Iraq. The Msha'sha'iya believed that the end times were imminent and that they would need to defeat the Safavids and gain control of Iran in order to fulfill the prophecy heralded by ibn Falah.

The Msha'sha'iya gradually abandoned their eschatological beliefs and more closely adhered to mainstream Shi'a orthodoxy. Like other mystical Shi'a sects, they placed a great deal of importance upon poetry and art. Unreferenced sources indicate that their rule ended towards the 1800s with the rise to power of the Bani Kaab, which under the leadership of Sheikh Jabir al-Kaabi had become the dominant power in the western region of Iran. However, Momen writes that by the 16th century they were already reduced to being simply the governors of Khuzestan^[4].

Moojan Momen "An Introduction to Shi'i Islam", Yale Univ. Press, 1985 ISBN-0-300-03499-7 397pp