Penalva do Castelo (Portuguese pronunciation:[pɨˈnaɫvɐ ðu kɐʃˈtɛlu]) is a municipality in the district Viseu in Portugal. The population in 2011 was 7,956, in an area of 134.34km².
The present mayor is Leonídio Gomes Monteiro, elected by a coalition between the Social Democratic Party and the People's Party. The municipal holiday is August 25.