Yolbaşı is a neighborhood in Bigadiç District, in Balıkesir Province, Türkiye. Yolbaşı lies at 269 m above sea level, 0.4 km from the Alaçam Dağları mountains. It has 173 inhabitants. The nearest city is Paşa Alanı, 33 km to the northwest. Among the landmarks around are Çamköy Dam (5.5 km), Attea (9.8 km) and Çaygören Dam (24 km).