Castel San Pietro Terme is a town and comune in the Emilia-Romagna region of northern Italy, situated in the province of Bologna.

The town's name derives from the medieval castle built by Bishop Pietro in the 8th century, which was later expanded and fortified in the 15th century.

Castel San Pietro Terme is renowned for its thermal springs, which have been known since ancient Roman times and are still used today for therapeutic purposes.

The town's historic center features a well-preserved medieval layout, with narrow streets, arches, and ancient buildings.

The main landmarks of Castel San Pietro Terme include the Castello di San Pietro, the Collegiata di San Pietro, and the Terme di San Petronio.

The Castello di San Pietro is a medieval fortress that served as a military and administrative center for the town.

The Collegiata di San Pietro is a Romanesque-Gothic church known for its 14th-century bell tower and its collection of Renaissance paintings.

The Terme di San Petronio is a thermal spa complex that offers a variety of treatments using the town's thermal waters.

The town's economy is primarily based on tourism, agriculture, and industry, particularly the production of ceramics and textiles.

Castel San Pietro Terme has a population of approximately 21,000 inhabitants, with a steady growth trend over the past decade.

The town is well connected by road and rail, with the nearest airport being Bologna Guglielmo Marconi Airport.

Castel San Pietro Terme has a vibrant cultural scene, with numerous festivals and events throughout the year, including the Festa della Madonna della Pace and the Palio del Niballo.

The town is home to the Biblioteca Comunale "G.C. Croce", which houses a valuable collection of books and manuscripts.

Castel San Pietro Terme has a rich history and has been influenced by various civilizations, including the Etruscans, Romans, and Lombards.

The town has contributed to Italian national politics and has a strong tradition of trade and commerce.