The Army of Conquest (Jaish al-Fatah) was a significant joint command center of Sunni Islamist Syrian rebel factions, formed in March 2015 under the coordination of Saudi cleric Abdullah al-Muhaysini during the Syrian Civil War. Described by some as an "al-Qaeda led coalition" aiming for an "Islamic state," its core members included al-Qaeda affiliates like al-Nusra Front (later Jabhat Fateh al-Sham) and the larger Ahrar al-Sham. With alleged material support from Qatar, Turkey, and Saudi Arabia, the coalition achieved notable early success, most notably capturing Idlib City on March 28, 2015, and subsequently seizing most of the Idlib Governorate.

Its effectiveness led to the formation of branches in other parts of Syria and influenced the structure of subsequent rebel coalitions. However, the Army of Conquest ultimately became defunct after January 21, 2017, due to escalating inter-rebel conflicts, particularly between Ahrar al-Sham and Jabhat Fateh al-Sham, and subsequent defections.