Kozcuğaz is a village in Ayancık District, in Sinop Province, Türkiye. Kozcuğaz lies at 1,017 m above sea level, in the Küre mountains. It has 129 inhabitants. The nearest city is Boyabat, 30 km to the south. Among the landmarks around are Erfelek Dam (15.0 km). Among the natural features are Tatlıca Waterfalls (11.5 km).