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 (known as Ozieri culture).
Main sights
The Cathedral of the Immacolata dates from the 15th century and was restored from 1550 to 1571. It has a nave and two aisles and houses a polyptych of the Madonna di Loreto (16th century), the work of a local master.
Grotte di San Michele (3500–2700 BC) - Ozieri gives its name to the Ozieri culture, a prehistoric civilization whose first findings were excavated in the local caves of San Michele starting from 1914.
Pont'ezzu, a Roman bridge dating to the 2nd century AD and restored in the 3rd–4th century AD. It has six arcades for a total length of 87.50 metres (287 ft)