Dereköy is a village in Daday District, in Kastamonu Province, Türkiye. Dereköy lies at 965 m above sea level, in the Küre mountains. It has 152 inhabitants. The nearest city is Kastamonu, 31 km to the east. Among the landmarks around are Mahmut Bey Mosque (20 km), Germeçtepe Dam (16.9 km) and Bezirgan Dam (12.6 km).