Seyitgazi is a town and district of Eskişehir Province in the Central Anatolia region of Turkey. The central town of Seyitgazi lies at a distance of towards the south from the province capital of Eskişehir. According to 2000 census, population of the district is 21,701 of which 3,281 live in the town of Seyitgazi. The district covers an area of , and the average elevation is .
The town was named after the 8th century Muslim saint and warrior Battal Gazi who fell in a battle here in 740. A külliye dedicated to Battal Gazi and containing his tomb, a mosque, a medrese, cells and ceremonial rooms for dervishes as well as benevolent services for the community such as kitchens and a bakery was built in 1208 on a hill overlooking the town by Ümmühan Hatun, wife of the Anatolian Seljuk sultan Gıyaseddin Keyhüsrev I and further extended in 1511 by the Ottoman sultan Bayezid II. The shrine and the adjoining complex remains much visited by visitors from across Turkey as well as by international visitors.