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The Judicate of Cagliari (Sardinian: Judicadu de Càralis / Càlaris, Italian: Giudicato di Cagliari) was one of the four kingdoms or judicates (iudicati, literally "judgeship") into which Sardinia was divided during the Middle Ages.

The Judicate of Cagliari occupied the entire southern portion of the island and was composed of thirteen subdivisions called curatoriae. It bordered the judicates of Arborea to the northwest and Logudoro and Gallura to the northeast.