| Jurisdiction: | Diocese |
| Viana do Castelo | |
| Latin: | Dioecesis Vianensis Castelli |
| Local: | Diocese de Viana do Castelo |
| Country: | Portugal |
| Province: | Braga |
| Metropolitan: | Archdiocese of Braga |
| Area Km2: | 2,108 |
| Population: | 253,310 |
| Population As Of: | 2010 |
| Catholics: | 245,217 |
| Catholics Percent: | 96.8 |
| Established: | 3 November 1977 |
| Cathedral: | The Cathedral of St Mary Major in Viana do Castelo |
| Patron: | Assumption of Mary |
| Bishop: | João Evangelista Pimentel Lavrador |
| Metro Archbishop: | Jorge Ortiga |
| Suffragan: | for one --> |
| Archdeacon: | for one--> |
| Map: | Dioceses de Portugal.PNG |
| Website: | Website of the Diocese |
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]