Riolo Terme ( or ) is a comune (municipality) in the Province of Ravenna in the Italian region Emilia-Romagna, located about southeast of Bologna and about southwest of Ravenna. The main attraction of the town are the termal baths.
Until 1957, the town was known as Riolo dei Bagni (Riolo of the Baths).
Riolo Terme borders the following municipalities: Borgo Tossignano, Brisighella, Casola Valsenio, Castel Bolognese, Faenza and Imola. It counts 5 hamlets (frazioni): Borgo Rivola, Cuffiano, Isola, Mazzolano and Torranello.
Riolo Terme is twinned with: