Fortezza di Sarzanello is a fortress located in the town of Sarzana, in the province of La Spezia, in Liguria, Italy. The fortress was built in the 14th century, during the period of conflicts between the Republic of Genoa and the Duchy of Milan, as a defense against potential attacks from the north.

The fortress is located on a hill overlooking the town of Sarzana and the surrounding valley. It consists of a central tower and several smaller towers and bastions. The central tower is four stories tall and has a square base, with walls up to 4 meters thick. The fortress also has a drawbridge, a moat, and a chapel.

Over the centuries, the fortress played an important role in the history of the region. During the Renaissance, it was used as a residence for the bishop of Luni, and in the 19th century it served as a prison. Today, the fortress is open to visitors, who can explore the various rooms and towers, and enjoy views of the surrounding landscape. The fortress also hosts various cultural events, including concerts and exhibitions.