Alacaatlı is a neighborhood in Sındırgı District, in Balıkesir Province, Türkiye. Alacaatlı lies at 211 m above sea level, in the Kepez Dağı mountains. It has 422 inhabitants. The nearest city is Kırkağaç, 38 km to the west. Among the landmarks around are Çaygören Dam (13.6 km), Stratonicea (26 km) and Thyatira (43 km).