The Sousa River (Portuguese: rio Sousa; pronounced [ˈsozɐ]) is a river in Portugal, a tributary of the Douro. It rises in the parish of Friande, Felgueiras, in the Porto District of northwest Portugal, and is a right tributary of the Douro, which it meets at the parish of Foz do Sousa, Gondomar, about 16 km from the mouth of the Douro.