Yeşilöz is a village in Devrek District, in Zonguldak Province, Türkiye. Yeşilöz lies at 669 m above sea level, in the Bolu Dağları mountains. It has 616 inhabitants. The nearest city is Devrek, 24 km to the northeast. Among the landmarks around are Heraclea Pontica (42 km) and Köprübaşı Dam (10.7 km). Among the natural features are Gümeli Porsuğu (14.1 km).