Shams al-Din Sunqur al-Ashqar al-Salihi (Arabic: شمس الدين سنقر الأشقر الصالحي) was the Mamluk viceroy of Damascus in 1279–1280, who attempted to rule Syria independently, in a rebellion against the Egypt-based sultan Qalawun (r. 1279–1290). While the rebellion in Damascus was quashed in 1280, Sunqur ensconced himself in the Sahyun Castle in the coastal mountains of northern Syria. He joined Qalawun in the successful defense of Syria against the Ilkhanid Mongols at the Battle of Homs in 1281. He remained in a state of peaceful relations with the sultan, despite ruling his coastal principality independently.