Ploaghe (Sardinian:Piàghe) is a comune (municipality) in the Province of Sassari in the Italian region Sardinia, located about 160 kilometres (99mi) north of Cagliari and about 20 kilometres (12mi) southeast of Sassari. As of 31 December 2004, it had a population of 4,781 and an area of 96.1 square kilometres (37.1sqmi).