Torre di Capo d'Uomo, Medieval coastal tower in Monte Argentario, Italy.

Torre di Capo d'Uomo is a defensive tower perched 350 meters (1,150 feet) above sea level on the western side of Monte Argentario. The structure features a square stone base with thick walls that command views of the Tyrrhenian Sea below.

The tower was built in the Middle Ages, most likely by the Aldobrandeschi before their lands passed to the Republic of Siena. In the second half of the 16th century it became a key link in the defensive system of the State of the Presidi, relaying light signals between the Torre di Cala Piccola and the Torre della Maddalena, which could not see each other. It kept its lookout role for centuries and was finally decommissioned in the 19th century.

The tower functioned as a watchtower for the community below, helping residents stay informed about threats from pirates and foreign vessels approaching the coast. Its role as a communication hub made it vital to everyday safety in this remote coastal region.

The ruins sit along the scenic coastal road on the western side of Monte Argentario between Porto Santo Stefano and Porto Ercole. The path has some steep sections, so wearing sturdy shoes helps when exploring the ruins and surrounding area.

Beside the tower stand the remains of a contemporary annex building whose purpose is still unknown, and the square scarp base survives only as an outline. The site was never bought privately because of its impervious position, so wind exposure accelerated its decay after decommissioning in the 19th century.