The Diocese of Mangalore (Latin: Diocesis Mangalorensis) is a Latin Church ecclesiastical jurisdiction or diocese of the Catholic Church located in the city of Mangalore, India. The diocese is a suffragan in the ecclesiastical province of the metropolitan Archdiocese of Bangalore. At present, it comprises the whole civil districts of Dakshina Kannada and Udupi in Karnataka state. The area of the Diocese was collectively referred to as South Canara during the Company rule in India, in the subsequent British India after Direct rule from London commenced & in the early post-independence Bombay state, prior to the States Reorganisation Act (1956). It was established as a separate Apostolic Vicariate from the Apostolic Vicariate of Verapoly in 1853, and was promoted to a diocese on 1 September 1886.

On Monday, July 16, 2012, it lost territory when Pope Benedict XVI erected the new Roman Catholic Diocese of Udupi (made up of the three civil townships of Udipi, Karkala& Coondapoor), which will also become part of the Province of Bangalore.

• St. Mariam Baouardy helped found the missionary Carmel of Mangalore.
• Servant of God Raymond Francis Camillus Mascarenhas
• Amelia Cimolino

• Apostolic vicariate
• Church of Most Holy Saviour, Agrar
• Church Of Sacred Heart Of Jesus, Madanthyar
• Belthangady Varado
• Monsignor Ambrose Madtha
• Most Holy Redeemer Church, Belthangady
• Diocese of Belthangady
• St. John the Baptist Church, Permude
• St. Joseph's Monastery, Bikarnakatte
• St. Patrick Church, Siddakatte
• Cathedral of Our Lady of Miracles

• Official website of the Mangalore Diocese
• History of the Mangalore Diocese
• History of the Mangalore Diocese
• Mangalore Diocese on Catholic Hierarchy
• Mangalore Diocese on Catholic Encyclopedia
• Mangalore Diocese on GCatholic.org

12°51′22″N 74°50′11″E / 12.8562°N 74.8363°E / 12.8562; 74.8363