Dereköy is a neighborhood in İznik District, in Bursa Province, Türkiye. Dereköy lies at 254 m above sea level, in the Samanli mountains. It has 300 inhabitants. The nearest city is İznik, 7.3 km to the west. Among the landmarks around are Nicaea (7.5 km), Nicomedia (37 km) and Green Mosque (6.9 km).