Köseli is a village in Gemerek District, in Sivas Province, Türkiye. Köseli lies at 1,427 m above sea level, 0.7 km from the Hınzır Dağı mountains. It has 102 inhabitants. The nearest city is Şarkışla, 21 km to the northeast. Among the landmarks around are Yapıaltın Dam (17.7 km).