Hasanlar is a village in Gerede District, in Bolu Province, Türkiye. Hasanlar lies at 1,303 m above sea level, 1.1 km from the Köroğlu mountains. It has 64 inhabitants. The nearest city is Gerede, 13.4 km to the west. Among the landmarks around are Hadrianopolis in Paphlagonia (22 km).