The Battle of Fakhkh (Arabic: يوم فخ, romanized: yawm Fakhkh, lit. 'Day of Fakhkh') was fought on 11 June 786 between the forces of the Abbasid Caliphate and the supporters of a pro-Alid rebellion in Mecca under al-Husayn ibn Ali al-Abid, a descendant of Hasan ibn Ali.
Husayn and his supporters planned an uprising at Medina during the annual Hajj pilgrimage of 786, but their hand was forced by a confrontation with the local governor, al-Umari. The conspirators rose in revolt on the morning of 16 May, and seized the Mosque of the Prophet, where Husayn's supporters swore allegiance to him. The revolt failed to gather support among the populace, and the reaction of the Abbasid garrison prevented the rebels from establishing control over the city, and eventually confined them to the Mosque itself. After eleven days, the Alids and their supporters, some 300 strong, abandoned Medina and headed to Mecca.