Karasar is a village in Divriği District, in Sivas Province, Türkiye. Karasar lies at 1,631 m above sea level, in the Deli Dağ mountains. It has 95 inhabitants. The nearest city is Sivas, 98 km to the northwest. Among the landmarks around are Divriği Great Mosque and Hospital (18.8 km) and Mursal Dam (13.0 km).