Calangianus (Italian: [kalanˈdʒaːnus]; Gallurese: Caragnani [karaˈɲanj]; Sardinian: Calanzanos [kalanˈdzanɔzɔ]) is a municipality in the Province of Sassari in the Italian region Sardinia, located about 190 kilometres (120 mi) north of Cagliari and about 25 kilometres (16 mi) west of Olbia.

The territory of Calangianus has been inhabited since the Bronze Age, and was also settled during the Roma Republic and the Roman Empire.

In the Middle Ages, Calangianus belonged to the Giudicato of Gallura, and was later ruled by the Aragonese and the Spanish Empire.

In the 17th century Calangianus has an important repopulation after several epidemics that scourged Sardinia, and became the second city of Gallura for population.

Calangianus in 1977 held its first exhibition of cork, and in 1987 obtained the title of one of the hundred most industrialized municipalities of Italy.