The Tower of Castelluchju (Corsican: Torra di Castelluchju) is a ruined Genoese tower located in the commune of Ajaccio (Corse-du-Sud) off the west coast of the Corsica.

The tower was one of a series of coastal defences built by the Republic of Genoa between 1530 and 1620 to stem the attacks by Barbary pirates.

[1] The exact year when the tower was built is not known,[2] but it is mentioned in a report written in 1597 for the Genoese authorities by the engineer Britio Tramallo and the lawyer Gieronimo Bonaparte.

[3] It sat on the highest point of the Grande Sanguinaire island but was demolished in the 19th century when the existing lighthouse was constructed.

[4] In Genoese documents the large round tower was referred to as the Sanguinare di Fuori or the Sanguinare di Mare while the Tour de la Parata was the Sanguinare di Terra.