Torre di Calamosca, 17th century coastal defense tower in Calamosca Beach, Italy

Torre di Calamosca stands on the Sant'Elia hill in the San Bartolomeo area of Cagliari, above the small Calamosca beach that gives it its name. Its original 1638 structure is a cylindrical tower, raised in the mid-19th century by an upper cylindrical section; a lighthouse was built beside it at the same time. The complex belongs to the Italian Navy.

The tower was built in 1638 during Spanish rule by the Real Amministrazione delle Torri and served as a military fortification with cannons to defend Cagliari's coast. The structure was modified in the mid-1800s when an additional section was added.

The tower displays a Spanish royal coat of arms in its inscription, marking the architectural and military influence of Spanish rule over the island. Visitors can still observe these visible symbols of that historical period today.

The complex belongs to the Italian Navy, so the tower and adjacent lighthouse are not open to visitors; the site is seen from the Calamosca beach below or from the path on the Sant'Elia hill. The 1638 plaque with the Spanish royal coat of arms is on the exterior wall.

The tower was also called torre dei segnali because signals were sent from it to Cagliari's Castello district to warn of passing ships. Its other name, torre de armas, came from the powerful cannons it housed.