- Source: Roman Catholic Diocese of Viana do Castelo
- Roman Catholic Diocese of Viana do Castelo
- Viana do Castelo (disambiguation)
- List of Catholic dioceses (structured view)
- Anacleto de Oliveira
- Roman Catholic Archdiocese of Braga
- Catholic Church in Portugal
- José Augusto Martins Fernandes Pedreira
- List of Catholic dioceses (alphabetical)
- List of churches in Portugal
- Viana, Espírito Santo
The Diocese of Viana do Castelo (Latin: Dioecesis Vianensis Castelli), is a Latin Church diocese of the Catholic Church in the Norte Region of Portugal. It has existed since 1977. It is a suffragan of the archdiocese of Braga, with its see at Viana do Castelo.
The current bishop is João Evangelista Pimentel Lavrador.