Ergünü is a village in Sason District, in Batman Province, Türkiye. Ergünü lies at 914 m above sea level, in the Southeastern Taurus mountains. It has 430 inhabitants. The nearest city is Kozluk, 19.3 km to the south. Among the landmarks around are Malabadi Bridge (32 km), Hallan Çemi (24 km) and Garzan Dam (15.5 km).