Sinandede is a neighborhood in Sındırgı District, in Balıkesir Province, Türkiye. Sinandede lies at 816 m above sea level, in the Kepez Dağı mountains. It has 129 inhabitants. The nearest city is Akhisar, 39 km to the southwest. Among the landmarks around are Çaygören Dam (12.4 km) and Thyatira (40 km).