Kocaoğlu is a village in Yığılca District, in Düzce Province, Türkiye. Kocaoğlu lies at 522 m above sea level, in the Akçakoca Dağları mountains. It has 367 inhabitants. The nearest city is Düzce, 17.1 km to the southwest. Among the landmarks around are Heraclea Pontica (38 km), Hasanlar Dam (5.2 km) and Prusias ad Hypium (18.4 km).