Seydinali is a village in Gemerek District, in Sivas Province, Türkiye. Seydinali lies at 1,338 m above sea level, in the Hınzır Dağı mountains. It has 332 inhabitants. The nearest city is Şarkışla, 30 km to the northeast. Among the landmarks around are Sarıoğlan Dam (16.9 km).