Ozieri is a comune of approximatively 11,000 inhabitants in the province of Sassari, in the Italian region of Sardinia, in the Logudoro historical re…Ozieri is a comune of approximatively 11,000 inhabitants in the province of Sassari, in the Italian region of Sardinia, in the Logudoro historical region. Its cathedral of the Immacolata is the episcopal see of the Roman Catholic Diocese of Ozieri. Ozieri is the centre of the earliest known archaeological culture on Sardinia.