Firminópolis is a municipality in eastern Goiás state, Brazil.
Highway connections with Goiânia are made by state highway BR-069 west from Goiânia, through Trindade, Santa Bárbara de Goiás, Turvânia, and then 19 kilometers west to Firminópolis. Neighboring municipalities are Turvânia, Aurilândia, and Turvânia.