Alaşehir, in Antiquity and the Middle Ages known as Philadelphia (i.e. "city of brotherly love") is a town and district of Manisa Province in the Aegean region of Turkey. It is situated in the valley of the Kuzuçay (Cogamus in antiquity), at the foot of the Bozdağ Mountain (Mount Tmolus in antiquity). The town is connected to İzmir by a railway. The longtime mayor is Gökhan Karaçoban.
It stands on elevated ground commanding the extensive and fertile plain of the Gediz River, (Hermus in antiquity) presents at a distance an imposing appearance. It has several mosques and Christian churches. There are small industries and a fair trade. From one of the mineral springs comes a heavily charged water popular around Turkey.
Within Turkey, the city's name is synonymous with the dried Sultana raisins, although cultivation for the fresh fruit market, less labour-intensive than the dried fruit, gained prominence in the last decades. As Philadelphia, Alaşehir was a highly important center in the Early Christian and Byzantine periods, and remained a titular see of the Catholic Church.