Yeniköseler is a neighborhood in Polatlı District, in Ankara Province, Türkiye. Yeniköseler lies at 672 m above sea level, 7.8 km from the Sündiken mountains. It has 461 inhabitants. The nearest city is Şehitlik, 23 km to the southeast. Among the landmarks around are Gordion (10.0 km) and Gordion Museum (10.4 km).