Ahatlı is a neighborhood in Gebze District, in Kocaeli Province, Türkiye. Ahatlı lies 6.2 km from the Akçakoca Dağları mountains. It has 134 inhabitants (2022). The nearest city is Çınarlı, 22 km to the southeast. Among the landmarks around are Nicomedia (30 km), Helenopolis (33 km) and Osman Gazi Bridge (29 km).