Porto do Son (Galician pronunciation: [ˌpɔɾtoðoˈsoŋ]) is a municipality of northwestern Spain in the province of A Coruña, in the autonomous community of Galicia. It belongs to the comarca of Noia. The municipality of Porto do Son encompasses a collection of coastal towns and villages in the “ria de Muros e Noia”, including the town of Porto do Son itself, and other towns such as Portosín.