The Battle of Marj Rahit is one of the early battles of the Second Islamic Civil War.

It is fought on 18 August 684 between the armies of the Banu Kalb tribal group, supporting the Umayyads under Caliph Marwan I, and the Banu Qays under al-Dahhak ibn Qays al-Fihri, who support Abdallah ibn al-Zubayr, who has proclaimed himself Caliph at Mecca.

The Kalbi victory consolidates the position of the Umayyads, under Marwan I, over Syria, paving the way for their eventual victory in the civil war against Ibn al-Zubayr.

However, it also leaves a bitter legacy of division and rivalry between the Qaysis and the Kalbis, which will contribute to much strife and instability for the remainder of the Umayyad Caliphate.