Ittireddu (Sardinian: Itireddu) is a comune (municipality) in the Metropolitan City of Sassari in the Italian region Sardinia, located about 150 kilometres (93 mi) north of Cagliari and about 35 kilometres (22 mi) southeast of Sassari.

Ittireddu borders the following municipalities: Bonorva, Mores, Nughedu San Nicolò, Ozieri.

Sights include the church of Santa Croce, an example of Byzantine-Romanesque architecture (9th-13th centuries).