Dereköy is a neighborhood in Mudanya District, in Bursa Province, Türkiye. Dereköy lies at 148 m above sea level, in the Katırlı Dağları mountains. It has 531 inhabitants. The nearest city is Mudanya, 9.6 km to the northeast. Among the landmarks around are Apamea Myrlea (9.5 km), Apollonia ad Rhyndacum (18.5 km) and Grand Mosque of Bursa (27 km). Among the natural features are Ayvaini Cave (23 km).