Torre Mozza, Coastal defensive tower in Piombino, Italy.

Torre Mozza is a coastal fortification in the southern part of Piombino, on the Gulf of Follonica. It consists of three buildings joined together: the oldest, facing the sea, is a square-plan watchtower from the first half of the 16th century with thick walls; the other parts were added on the landward side, including a small palazzo. An external staircase leads to the tower's levels. The complex now operates as a hotel.

The Appiani lords of Piombino built the tower around 1500 to sight ships carrying minerals from the island of Elba and to guard the coast against Saracen pirate raids. It belonged to the coastal tower system of the Grand Duchy of Tuscany. A landing dock for lignite was added later.

The tower served as a watch point over shipping routes and as a symbol of control over the coast for the ruling family. Its presence shaped how people understood security and power along this stretch of Tuscan shoreline.

The tower sits right at the shoreline and is easily accessible by foot from nearby roads. Swimming in the sea near the tower is possible, particularly over the reef formation just offshore.

The reef off the beach is beach rock, a submerged rock ledge about 10 metres from the waterline, not coral. A local legend wrongly calls it the remains of the Roman Via Aurelia, whose route actually ran further east inland and in another direction.