Kocaçavuş is a village in Pervari District, in Siirt Province, Türkiye. Kocaçavuş lies at 1,482 m above sea level, in the Yazlıca Dağı mountains. It has 294 inhabitants. The nearest city is Şırnak, 46 km to the south. Among the landmarks around are Aparank Monastery (15.0 km), Beğendik Bridge (7.1 km) and Çetin Dam (19.5 km).