Tosunlar is a village in Devrek District, in Zonguldak Province, Türkiye. Tosunlar lies at 341 m above sea level, in the Akçakoca Dağları mountains. It has 232 inhabitants. The nearest city is Devrek, 6.6 km to the southeast. Among the landmarks around are Heraclea Pontica (42 km) and Kozlu Dam (19.1 km). Among the natural features are Gökgöl Cave (20 km).