Torra di Mortella, Genoese tower on Mediterranean coast in Saint-Florent, France.

Torra di Mortella is a ruined square Genoese tower of rough stacked stone in pale beige and grey, standing on a low rocky base near Punta Mortella in Saint-Florent. Its lower half is solid masonry; the upper section has an open arched window on the left and a smaller arched opening to its right, both framed in squared stone. The roofline and upper right corner are broken away, leaving a stepped profile, and the right side tapers inward toward the base.

Giovan Giacomo Paleari Fratino designed the tower and Colonel Giorgio Doria directed its construction between 1563 and 1564, one of a series of coastal defences the Republic of Genoa built between 1530 and 1620 against Barbary pirates. In February 1794 two British warships failed to take it by sea, and it fell only after two days of land fighting under David Dundas and John Moore. When the British left Corsica in 1796 they blew it up.

The British copied the tower's design after capturing it in 1794, and their misspelling of its name as "Martello" gave the Martello towers of their empire their name. The ruined tower was listed as a Historical Monument of France in 1991, and the Conservatoire du littoral has owned the site since 1980.

The tower sits on a headland that is accessible by walking paths, allowing visitors to approach it from different angles. The best time to visit is earlier in the day when the sun does not create harsh shadows on the structure.

The British Army later built similar towers throughout their empire and named them Martello towers due to a misspelling of this site's name. This naming mistake became so widespread that the term stayed and is still used today for such structures worldwide.