Hacıoğlu is a village in Ayancık District, in Sinop Province, Türkiye. Hacıoğlu lies at 244 m above sea level, in the Küre mountains. It has 192 inhabitants. The nearest city is Sinop, 47 km to the east. Beaches nearby: Ali Köyü (7.1 km), Ayancık Köyü (7.4 km), Ayancık (7.9 km). Among the landmarks around are Erfelek Dam (12.9 km). Among the natural features are Tatlıca Waterfalls (14.0 km).