Çaydeğirmeni is a town in Devrek District, in Zonguldak Province, Türkiye. Çaydeğirmeni lies at 60 m above sea level, in the Akçakoca Dağları mountains. It has 7,034 inhabitants (2022). The nearest city is Devrek, 11.2 km to the southwest. Among the natural features are Çayırköy Cave (20 km).