The early insurgency phase of the Syrian civil war lasted from late July 2011 to April 2012, and was associated with the rise of armed oppositional militias across Syria and the beginning of armed rebellion against the authorities of the Syrian Arab Republic. Though armed insurrection incidents began as early as June 2011 when rebels killed 120–140 Syrian security personnel, the beginning of organized insurgency is typically marked by the formation of the Free Syrian Army (FSA) on 29 July 2011, when a group of defected officers declared the establishment of the first organized oppositional military force. Composed of defected Syrian Armed Forces personnel, the rebel army aimed to remove Bashar al-Assad and his government from power.

The Syrian civil war is an ongoing multi-sided conflict in Syria involving various state-sponsored and non-state actors. In March 2011, popular discontent with the rule of Bashar al-Assad triggered large-scale protests and pro-democracy rallies across Syria, as part of the wider Arab Spring protests in the region. After months of crackdown by the government's security apparatus, various armed rebel groups such as the Free Syrian Army began forming across the country, marking the beginning of the Syrian insurgency. By mid-2012, the crisis had escalated into a full-blown civil war.