Umāra ibn Abī al-Ḥasan al-Yamanī (Arabic: عمارة بن ابي الحسن اليمني) was a historian, jurist and poet of Yemen of great repute who was closely associated with the late Fatimid Caliphate of Egypt. He was executed by order of Saladin at Cairo on April 6, 1174 for his part in a conspiracy to restore Fatimid rule. His Tarikh al-Yaman is the earliest, and in respects the most important, history of Yemen from the Islamic era.