Osmanuşağı is a village in Gemerek District, in Sivas Province, Türkiye. Osmanuşağı lies at 1,528 m above sea level, in the Hınzır Dağı mountains. It has 52 inhabitants. The nearest city is Şarkışla, 16.3 km to the northeast. Among the landmarks around are Yapıaltın Dam (12.5 km) and Maksutlu Dam (24 km).