Dereözü is a village in Daday District, in Kastamonu Province, Türkiye. Dereözü lies at 1,012 m above sea level, in the Küre mountains. It has 70 inhabitants. The nearest city is Kastamonu, 35 km to the east. Among the landmarks around are Mahmut Bey Mosque (25 km), Bezirgan Dam (8.9 km) and Germeçtepe Dam (21 km).