Domaniç is a town located in the Kütahya Province within the Aegean region of Turkey. It serves as the administrative seat of the Domaniç District and has a recorded population of 4,855 as of 2022.
The area holds historical significance as it was one of the locations where Osman I, the leader of the Kayi tribe, founded the Ottoman Beylik. This foundation occurred in the vicinity of both Domaniç and Söğüt.