Seyitgazi is a municipality and district located in the Eskişehir Province of Turkey. Covering an area of 1,578 km2, it has a recorded population of 12,587 as of 2022.
The central town of Seyitgazi is situated approximately 43 km (27 mi) south of the provincial capital, Eskişehir. Historically, the town was known by the name Nakoleia.