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.[1]
The current bishop is João Evangelista Pimentel Lavrador.[2]