Sayf Balud, also known by the alias Sayf Abu Bakr (Arabic: سيف أبو بكر), is a Syrian rebel leader who has fought for several armed opposition factions in the Syrian Civil War. Having served with the Free Syrian Army during the conflict's early stages, he reportedly joined the Islamic State of Iraq and the Levant (ISIL) in 2013, possibly as a spy for the Turkish intelligence. He defected from ISIL in 2014, and consequently became the commander of the CIA-supported Hazzm Movement and later the Hamza Division. In September 2021, he became the deputy leader of the Syrian Front for Liberation. As part of these groups, he has become an important ally of Turkey within the armed Syrian opposition. He also acts as the de facto military governor of al-Bab since 2017.